Physiology practicums : explicit directions for examining portions of the cat, and the heart, eye, and brain of the sheep, as an aid in the study of elementary physiology.
- Wilder, Burt G. (Burt Green), 1841-1925.
- Date:
- 1895
Licence: Public Domain Mark
Credit: Physiology practicums : explicit directions for examining portions of the cat, and the heart, eye, and brain of the sheep, as an aid in the study of elementary physiology. Source: Wellcome Collection.
Provider: This material has been provided by the Gerstein Science Information Centre at the University of Toronto, through the Medical Heritage Library. The original may be consulted at the Gerstein Science Information Centre, University of Toronto.
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![white cord, the ULNAR NERVE. Trace it to the elbow, where it is lodged in a notch between the projecting olecranon process (PI. I) and the ulnar projection of the humerns. a. It has the same location in man and, notwithstanding the protec- tion from injury thus afforded, an unguarded blow upon this part of the elbow may so far press upon the nerve as to cause the tingling and more or less painful sensation known as crazy-bone. b. Slit the fascia of the antibrachium and separate the muscles so as to follow the nerve distad. At about the middle of the length of the anti- brachium it divides into two branches of which one is distributed to the palm and the other to the dorsal skin of the hand ; branches are given off to the pad at the wrist joint. § 17. Division of the Triceps.—Transect it at about the middle ; turn the distal half away from the bone, leaving it attached for later observa- tion. Cut the proximal half from the humerns and scapula. § 18. The Musculo-Cutaneous Nerve.—Between the biceps and the bone push first a scalpel-handle and then a finger ; then draw the muscle gently from the bone and rotate it slightly. This will, expose a NERVE, the MUSCULO-CUTANEOUS, which emerges from the parts about the shoul- der, sends several branches to the proximal part of the biceps and then continues to the elbow, passes to the radial side of the arm, and is distrib- uted to-the skin ; Anatomical Technology, Fig. 103, N. Met., and § 1022. a. Like many other nerves it supplies both muscle and skin, con- taining fibers derived from both the ventral (motor or anterior) and dorsal (sensory or posterior) spinal nerve roots ; it is a mixed nerve; see Practicum VI, the MYEL. §19. Origin of the Biceps.—The tapering proximal end of the mus- cle terminates in a single, subcylindrical tendon (sinew) which enters a groove in the bone covered by a fibrous sheet ; PI. V, j, 4. Slit the sheet and follow the tendon to its attachment on a slight projection of the lip of the glenoid cavity of the scapula. a. The second tendon of origin in man from the tip of the coracoid process (whence the name biceps) is absent in the cat; PI. V. S 20. The Brachialis.—Partly covered by the biceps and lying closely against the outer side of the humerus is the BRACHIALIS (brachialis anticus]. The distal ends of the two muscles may be followed together as directed in § 21. §2i. Insertion of the Biceps.—This is hidden by muscles of the antibrachium arising from both sides of the humerus but especially from the radial (outer) side. These must be cutaway, though not neces- sarily so far distad as in PI. V. Transect the muscles of the antibrach- ium covering the insertion of the biceps at about one-third of the way from the elbow to the wrist, and peel the proximal portions toward the wrist, but without cutting them away at their origins. a. The fibrous sheath, FASCIA, covering them receives a slip of ten- don from the biceps. This really constitutes a second and considerable insertion of the muscle, so that, especially in the absence of the second head one might well regard this muscle in the cat as a bipes rather than a biceps. $ 22. Insertion of the Brachialis.—Use the tracer as much as possible, the scalpel sparingly, and ascertain that the brachialis is inserted upon the ulna, while the tendon of the biceps passes between the ulna and the](https://iiif.wellcomecollection.org/image/b20996603_0018.jp2/full/800%2C/0/default.jpg)
