Topographical anatomy of the dog / by O. Charnock Bradley.

  • Orlando Charnock Bradley
Date:
1927
Catalogue details

Licence: In copyright

Credit: Topographical anatomy of the dog / by O. Charnock Bradley. Source: Wellcome Collection.

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    medial to the axillary artery and the brachial plexus to divide before long into the ascending cervical and transverse scapular arteries. The ascending cervical arie7y (a. cervicalis ascendens) runs for a distance on the medial surface of the brachio-cephalic muscle, and finally enters the substance of this muscle. The transverse scapular artery (a. transversa scapulae) passes towards the cranial border of the subscapular muscle and divides into several branches, the main one of which accompanies the suprascapular nerve. N. phrenicus.—The phrenic nerve will be found between the axillary vein and artery dorsal to the omo-cervical arterial trunk. It arises by three roots from the ventral divisions of the fifth, sixth, and seventh cervical nerves, and leaves the present dissection by entering the thorax. Later, it will be traced to the diaphragm to which it carries motor impulses. Dissection.—Cut across the axillary vessels, close to the first rib. This allows of a more complete inspection of the brachial plexus. Plexus brachialis. — The brachial plexus is a somewhat complex arrangement of nerves formed by branches from the last three cervical and the first two thoracic nerves. It is placed between the axillary vessels and the scalenus muscle. Its branches are: Nerve to the braehio-cephalic muscle^ n. supraseapularis^ n. subscapularis^ n. ^nusculocutaneus^ n. axillaris^ n. radialis^ n. medianus^ n. ulnaris^ n. thoracodorsalis^ 7in. pectorales^ and n. thoraealis lo7igus. Most of these will be examined in the dissection of the limb; but the following points should be noted at the present moment. The pectoral nerves (nn. pectorales) are mainly distributed to the pectoral muscles. One of them supplies the skin and cutaneous muscle on the side of the chest and abdomen. The thoraco-dorsal nerve (n. thoracodorsalis) supplies the latissimus dorsi muscle. If the subject is a male the external genital organs should next be dissected. External Genital Parts (^Partes genitales externcP).—The male external genital parts consist of the scrotum, the penis, and the prepuce. The scrotum is a membranous bag with a double cavity in which the testes are lodged. It lies between the thighs, and forms a rounded prominence crossed in a cranio-caudal direction (usually obliquely) by a shallow groove in which a faint line, the raphe scroti^ may be detected. The skin of the scrotum is thin and provided with comparatively few hairs. Dissection.—Make an incision through the skin along the raphe of the scrotum, and expose the underlying tissues.