Practical anatomy: a manual of dissections / by Christopher Heath.

  • Christopher Heath
Date:
1870
Catalogue details

Licence: Public Domain Mark

Credit: Practical anatomy: a manual of dissections / by Christopher Heath. Source: Wellcome Collection.

Provider: This material has been provided by the Francis A. Countway Library of Medicine, through the Medical Heritage Library. The original may be consulted at the Francis A. Countway Library of Medicine, Harvard Medical School.

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    of the forearm and thus give a firm origin to the muscles which arise from it.] This must be divided in order to see the tendon of the biceps, which passes deeply to be inserted into the back of the bicipital tubercle of the radius, a bursa being placed between the tendon and the upper smooth sur- face of the tubercle. The tendon becomes flattened near its insertion, and is twisted so that its edges become anterior and posterior. The action of the biceps is to supinate the forearm, and then flex it upon the upper arm, being a good example of force applied to a lever of the third order. Its action as an extensor of the upper arm is very slight. The Coraeo-braehialis (Fig. 7, 6) arises from the tijD of the coracoid process, in common with, but to the inner side of, the short head of the biceps. It is generally pierced by the external cutaneous nerve, and is inserted on the inner side of the shaft of the humerus about its middle, and exactly opposite the insertion of the deltoid. It draws inward and flexes the humerus. The Brachialis antieus (Fig. 9, ii) arises from the front of the shaft of the humerus in its lower half; it has two slips which embrace the insertion of the deltoid, and the fibres have also an extensive attachment to the internal intermuscular septum, and a smaller one to the upper part of the external intermuscular septum above the supinator longus. It is inserted into a triangular surface on the front of the coronoid process of the ulna, covering the front of the elbow-joint. It is the direct flexor of the forearm upon the upper arm. The biceps, coraco-brachialis and brachialis antieus are supplied by the external or musculo-cutaneous nerve ; and the brachialis antieus has an additional supplj' from the musculo-spiral nerve, which is close to its outer border, lying deeply between it and the supinator longus. - The Brachial Artery (Fig. 9, 14) is the direct continua- tion of the axillary, and extends from the lower border of the teres major to the point of bifurcation into radial and idnar arteries, Avhich is usually at the bend of the elbow. The artery is superficial, or at least crossed by no muscle, in the whole of its course, and it gradually turns from the inner side of the arm to the middle of the bend of the elbow. [Its line is from the junction of the anterior and middle thirds of the axilla to the middle of the bend of the elbow.] In frovt it has only the fascia and skin, except that at about the middle of the arm it is generally crossed b}' the