Digitized by the Internet Archive in 2015 https://archive.org/details/elementsofanatomOOshar_0 ELEMENTS OF ANATOMY; DESIGNED FOR THE USE OF STUDENTS IN THE FINE ARTS. BY JAMES BIRCH SHARPE, MEMBER OF THE ROYAL COLLEGE OF SURGEONS, AND STUDENT IN THE ROYAL ACADEMY OF ARTS. LONDON : PRINTED FOR R. HUNTER. (SUCCESSOR TO MR. JOHNSON) No. 72, ST. PAUL'S CHURCH-YARD. 1818. Printed by J. M'Creery, Black-HorseCourt, London. TO HENRY FUSELI, A.M. ROYAL ACADEMICIAN, KEEPER OF THE ROYAL ACADEMY OF ARTS, PROFESSOR OF PAINTING, &c. &c. &c. IS INSCRIBED, AS AN HUMBLE TRIBUTE OF RESPECT FOR HIS EXALTED GENIUS, A MEMORIAL OF HIS KINDNESS AND CONDESCENSION, AND AS A TESTIMONY OF THE GREAT ADVANTAGES AND HIGH HONOUR DERIVED FROM HIS INVALUABLE INSTRUCTION. IN THE Eopal acatremp of arte, BY HIS MOST OBLIGED SERVANT, THE AUTHOR. Hoxton, Aug. H^th, 1818. r- * J ERRATA. Page 5. Line 14. 26. 20. V for obliqus, read obliquus. 27. 18. J 12. 12. "1 25. 14. Vfor grove, read groove. 29. 25.J 41. 3. dele and. 42. 37. for biceps, read triceps. 17. 33.") for astiiigulus, read astragalus. Note. — The description of Fig. 4, Plate 5. answers for Fig. 6 also. if SECTION J. INTRODUCTION, AND DEFINITIONS. SECTION I. INTRODUCTION, Sfc. or bones of the leg, and The Patella, ) The Foot. The femur or thigh-bone, is the largest of the long bones in the human skeleton, and forms the upper division of the leg. The upper extremity of this bone is formed into a ball, and is called its head ; this is so constructed for the purposes of extended motion at the hip-joint; externally is a tube- rosity called the trochanter major, or great trochanter. The student must constantly bear in mind this process, as it forms the contour in the hollow of the thigh at the hip- joint, and gives attachment to important muscles. Opposite to this and a little lower is situated a similar, but smaller, process, called the trochanter minor, or lesser trochanter. The femur is rounded and smooth in front, but is rough 17 behind. (Vide plate II.) This roughness is called the linea aspera, and gives attachment to several muscles. At the lower extremity this bone extends on each side, forming what are called its condyles; these are evidently for the pur- pose of articulation with the bone of the leg. It must be observed the inner condyle is the largest and longest, which occasions that inkneed appearance so conspicuous in the skeleton. The leg is composed of two bones, named the tibia and largest, the fibula and smallest. The tibia is a long angular bone, the larger extremity of which is the upper, so constructed as to receive the condyles of the femur; the front angle of the bone runs in a waved line, and is called its spine; it passes from a little projection of the bone, called the tuberosity, at its upper extremity, to the inner ancle: this bone at its lower extre- mity forms the inner ancle; the roughness on this bone is expressive of muscular attachment. At the knee-joint, and lying over the junction of the femur with the tibia, is placed the patella, or knee-pan; this is a small irregular and qua- drilateral bone ; it is kept in its place by means of a strong ligament attached to the tuberosity of the tibia. The fibula, or smaller bone of the leg, lies on the out- side of the tibia, and is attached to it at both its extremities by an articulating surface. The upper extremity, or head of the bone, may be felt on the living model, but its lower extremity projects considerably, and forms the outer ancle. The foot is anatomically divided into the tarsus, meta- tarsus, and the phalanges of the toes. The tarsus is composed of seven bones of irregular shape, and so constructed as to form an arch, the convexity of which constitutes the instep. The first, and most important, is the astragulus; this bone is articulated with the tibia, and extends on to the instep. The second, and next in importance, is the os calcis, or heel-bone, to which the tendo achillis is attached. The third is the os naviculare, or boat-like bone ; this is attached at the fore extremity of the astragulus ; it is a flattened circular body, placed vertically in the instep. The fourth is the os cuboides, or cubical bone; it is situ- ated on the outer side of the astragulus, and very materially assists in the arch of the instep. c 18 The three remaining bones are called ossa cuneiformia, or wedge-shape bones ; these are placed like the key-stones of an arch, the largest is at the base of the great toe, the next in magnitude is at the base of the third toe, and the least is situated between the two former, and receives the metatarsal bone of the second toe. The metatarsus is composed of five bones, long and slender; they spring from the tarsus, and are attached by means of separate articulations to the instep ; their extre- mities at the tarsus are large, the bodies of these bones are small, and their extremities at the toes are rounded, to form joints for the purpose of the extended motion of the toes. The metatarsal bone of the little toe projects consider- ably beyond the tarsus, and forms a conspicuous projection on the outer side of the foot. The toes are five in number, and consist of three rows, or phalanges of bones, one before the other; these bones di- minish in size as they approach to the extremities of the toes ; the great toe has but two of these phalanges. The form of these bones, in the first rank, is similar to those of the metatarsus, in the second rank they are very short; and the last rank, or those forming the ends of the toes, which, not being adapted to the purposes of articulation, are rounded off to a thin flat termination. Of the Superior Extremities. The superior extremities are composed of three parts, The Shoulders, The Arms, and The Hands. The scapula, plate or shoulder bone: this is a thin, triangular bone, situated on the upper and back part of the chest, having its most acute angle placed downwards; one side is smooth and concave, adapted to the arch of the ribs upon which it moves; the outer side is convex and princi- pally concerns the artist. The edges of this bone are called its costee, the superior costa gives attachment to muscles which elevate the arm, the inferior costa is covered by muscles which depress the arm. The principal parts to be observer! are its spine, terminating in a process called the acromion, its articulating cavity for the head of the arm- bone, and the coracoid process. Just below the articulating cavity is called the neck of 19 the bone, from which proceeds the coracoid process, to which is attached the coraco brachialis muscle. The spine crosses the scapula in an oblique direction, and hangs over the shoulder-joint, forming the acromion ; to it is attached the trapezius muscle. The clavicle, or collar-bone connects the scapula to the trunk. It is a thin long rounded bone, of the form of an italic S; one extremity is attached to the acromion, and the other to the upper part of the sternum, lying over the first rib. This bone gives attachment to a portion of the mas- toideus and pectoralis muscles. The os humeri, or bone of the arm. This bone is long and rounded ; its upper extremity is called its head, being in part globular, for the purpose of allowing every degree of motion to the shoulder-joint. This bone has two tuber- cles situated anteriorly, and separated by a groove. These tubercles are for the attachment of muscles, and the groove receives the long tendon of the biceps muscle. Towards its lower extremity it is flattened, and extends laterally into two condyles for the purpose of affording attachment to the flexor and extensor muscles of the fore-arm ; and also for the articulation of the ulna and radius. The fore-arm is composed of two bones named the radius and ulna. The radius is situated upon the outer part of the arm, and is articulated at each extremity with the ulna, upon which it is moved, performing the supination and pronation of the hand, and to which it is principally attached at its lower extremity. This bone is also articulated with the humerus, for the purpose of going along with the ulna, in the flexion and extension of the arm. At the upper extremity it is small, and a tubercle appears on its inner side, giving in- sertion to the biceps muscle. The lower extremity is ex- tended for the purpose of articulation with the bones of the carpus. The ulna lies on the inner side of the fore-arm ; it is a long and rounded bone, becoming gradually smaller as it descends to the wrist. The upper end of this bone pro- jects considerably backwards, forming that process called the olecranon. This process gives attachment to the tri- ceps. A large cavity in the back part of the humerus receives the olecranon, when the arm is in a right line. At th g c 2 20 lower extremity of this bone, and on its outer-side, is a little projection called the styloid process, from it a ligament passes to the carpus, for the protection of the wrist-joint. The carpus, or wrist, is composed of eight little bones, connected together in the form of an arch ; two only of them are necessary to be remarked particularly by the artist. The first, called the os pisiforme, or pea-shaped bone, is that bone which may so easily be felt on the inner edge of the wrist ; from it passes a strong ligament to the second of these bones, called the trapezium, it may be felt on the inner side, at the base of the thumb. The metacarpus is formed of four bones, very similar but more slender than the bones of the metatarsus. They are articulated at one extremity to the bones of the carpus, and the other to the bones forming the phalanges of the fingers ; these bones form the palm of the hand, and diverge from their bases towards their articulation with the fingers. The fingers, like the toes, are formed of three rows or phalanges ; and the same description answers to both : they are, however, longer and more stout. The thumb, by some, is said to possess but two rows of bones ; but then, under these circumstances, there are reckoned five metacar- pal bones : the thumb is not connected to the metacarpus, but is loose, and free to be moved in every direction, being attached only at its basis. SECTION UL MYOLOGY, OR THE DOCTRINE OF THE MUSCLES. SECTION III. OF THE NECK. Immediately in front of the neck is situated the organ of voice, a singular and beautiful piece of mechanism, formed principally of cartilage. Jt is this which causes the projection commonly called Adams apple: a vulgar desig- nation given to it in ignorance, and supported by super- stition. On each side of the organ of voice, which anato- mists term the larynx, is situated a muscle, termed The Sterno-cleido-mastoideus, So called from its attachments to the sternum, the cla- vicle, and the mastoid process of the temporal bone. This muscle, which gives so much beauty and elegance to the human neck, passes down from behind the ear to the ster- num in a fine and gently waving line ; at about two-thirds of its length from the ear it divides and sends off a similar column of flesh to the upper and anterior part of the clavicle. Use. — When they both act, they bend the head for- ward. When one only acts, it turns the head to one side, and in this case the other will appear in an oblique line, from the ear to the sternum, very strongly marked, even in the female neck. Over these muscles is another on each side, called The Platysma Myoides, or musculus cutaneus, or muscle of the skin. This muscle is composed of very slender fibres loosely united. It arises from the cellular substance covering the upper part of the deltoid and pectoral muscles. The fibres form a thin broad muscle, which runs obliquely upwards, and is inserted into the skin and muscles cover- ing the lower jaw. Use. — To draw the skin of the face downwards ; and, when the mouth is shut, to draw the skin of the neck 24 upwards. This muscle gives a degree of softness to the markings of the former one. The hack of the neck is described along with the mus- cles of the back ; but there is a small space between the upper attachment of the trapezius and the stemo-cleido- mastoidetis ; this space the artist may consider as filled up with fat, though a slight hollowness will always appear. A vein will sometimes appear in the course of the stemo- cleido-mastoideus, — it is called the jugular vein. Of the Muscles of the Head and Face. One large and tendinous muscle, called the occipito- frontal, covers the whole head. A portion of another muscle, called the temporalis, is seen situated on the temples. And one strong and tleshy muscle called the massetur, descending from the cheek- bone to be attached to the side of the lower jaw, as far as its angle. This muscle forms a swelling on each side of the lower jaw when the mouth is firmly shut. The muscles of the face are very slender and delicate, and, when in action, do not appear after the manner of the other muscles of the body. They lie under a consi- derable mass of fat, so that their form cannot be seen ex- teriorly. The character of the face does not depend en-/ tirely upon the soft parts : but it is necessary to shew these muscles, that the anatomical formation of the face may be understood. These muscles are described in the table to the fifth plate. Those who wish to go deeper into this subject may consult Mr. Bell's Treatise on the Anatomy of Ex- pression. It is nevertheless true, that the individual character is pourtrayed powerfully in the face ; but unless the indi- vidual can be seen when alone, or when unconscious of being seen by any person, no certain judgment can be formed upon information drawn from this source. It is in the osteology of the head and face that the true character of the individual is to be traced ; and a judg- ment formed from this source is more likely to be correct, because over the bony structure of the physiognomy no 25 one can have the least control. But this is a subject fo- reign to the present purpose : the artist must consult the great woj/k of the immortal Lavater, and compare his rules with nature, and well authenticated biography, if he means to pourtray the energies of the mind upon his canvas. Of the Muscles situated upon the front of the body, between the collar-bone and the pelvis. 1. The Pectoralis Major — Arises from the whole exter- nal surface of the sternum, from the 5th, 6th, and 7th ribs, and from two anterior thirds of the clavicle. The fibres run obliquely across the chest, and, forming a flat tendon, is inserted into the ridge of the os brachii, on the outside of the grove of the long head of the biceps flexor cubiti. Observations. — The tendon of this muscle is covered by the anterior edge of the deltoid ; it forms the anterior fold of the arm-pit. In the living model it forms a rounded border to the arm-pit, arising partly from the twisted course of its fibres at this edge, and partly from a quan- tity of condensed cellular substance, and some fat. This should be very carefully dissected away, to expose the whole of the muscle. This muscle forms that mass of flesh which covers the entire chest on each side of the sternum, and upon which the breasts are situated. Use. — To move the arm forwards and obliquely upwards, toward the sternum. Next in order follow the rectus and oblique muscles on each side of a perpendicular line drawn from the ster- num to the symphysis pubis. 2. The Rectus Abdominis — Arises by aflat tendon from the fore part of the os pubis ; as it ascends, its fleshy belly becomes broader and thinner, and is Inserted by a thin fleshy expansion into the ensiform cartilage terminating the sternum, and into the three in- ferior true ribs. Observations. — There are two of these muscles, one pas- sing on each side of a central tendon, called the linea alba. This line is gracefully disposed in the Mercury, and is most delicately delineated in all the antique" These muscles are intersected by four similar, but horizontally 26 disposed tendons, called linece transversa. One of these cross lines is situated at the navel, two above; and one not so strong as any of the others, below the navel. In the antique, however, the student will find thes>e transverse lines represented but in three places ; one at the navel, one between it and the chest, and the other below the navel, about one-third part distant from the pu bis. It is thus delineated in the Farnesian Hercules, the Laocoon, the Torso, the Gladiator, and in the anatomical figure in the Royal Academy. But all the four-lines are expressed in the statue of a Faun, formerly in the Villa Borghese. These muscles are inclosed in a tendinous sheath, which gives them greater strength and a regular flow of out- line. Use. — To compress the fore-part of the a bdomen, and to bend the body forwards, or to raise the pel vis. Situated on each side of the recti, and separated from them by a narrow tendinous line on their exterior edges are two muscles, called 3. The Obliqus descendens. — The obliqus descen- dens — arises by eight triangular fleshy slips from the lower edges and exterior surfaces of the eight inferior ribs, at a little distance from their cartilages. — The Jive superior slips meet on the ribs an equal number of slips, being the attachments of the serratus major anticus ; and the three lowermost slips are connected with the attachments which the latissimus dorsi has with the ribs. The muscular fibres proceed obliquely forwards and downwards, and terminate in that narrow tendinous line, wMch runs down on each side of the belly, called the linea semi-lunaris. Inserted into the two anterior thirds of the upper edge of the os ileum, into Pouparfs ligament* and into the os pubis. Observations. — From the above description, the student cannot mistake the situation and connexions of these mus- cles. By the digitations of these abdominal muscles, and the projections of the ribs, the ancients produced that fine arch, of the bo