. Bensley's Practical anatomy of the rabbit : an elementary laboratory text-book in mammalian anatomy. Rabbits -- Anatomy. THE BONES OF THE ANTERIOR LIMB 201 v5 i- tmi The Humerus The humerus (Fig. 93) is typical of the long bones of the proximal and middle segments of the fore and hind limbs in consisting of a central portion, the body or shaft of the bone, and of proximal and distal extremities for muscle attachment and articu- lation. The proximal extremity bears on its medial side a smooth, convex projection, the head of the humerus (caput humeri), for articulation with the scapula. The ar
. Bensley's Practical anatomy of the rabbit : an elementary laboratory text-book in mammalian anatomy. Rabbits -- Anatomy. THE BONES OF THE ANTERIOR LIMB 201 v5 i- tmi The Humerus The humerus (Fig. 93) is typical of the long bones of the proximal and middle segments of the fore and hind limbs in consisting of a central portion, the body or shaft of the bone, and of proximal and distal extremities for muscle attachment and articu- lation. The proximal extremity bears on its medial side a smooth, convex projection, the head of the humerus (caput humeri), for articulation with the scapula. The articulation is nom- inally a ball-and-socket joint, or enar- throsis, but the articulating surfaces are somewhat restricted, and the muscular arrangements of the limb are such that the range of lateral motion (abduction and adduction) is small. Immediately in front of the head of the bone there is a small elevation, the medial tuberosity or lesser tubercle (tuberculum minus). It is separated by a longitudinal furrow of the anterior surface, the intertubercular groove (sulcus inter- tubercularis), from a much larger lateral elevation, the lateral tuberosity or greater tubercle (tuber- culum majus). Extending distad from the latter is a triangular area, the deltoid tuberosity (tuberositas deltoidea), the tip of which reaches almost to the middle of the bone and forms a pronounced angle on its anterior surface. These tuberosities are for muscle attachment, mainly for the insertion of muscles moving the shoulder-joint. The distal extremity of the humerus bears a grooved articular surface, the trochlea humeri, for articulation with the radius and ulna. On its lateral side is a smaller surface, the capitulum. Fig. 93. Anterior surface of the left humerus: c, capitulum; , head of humerus; and , lateral and medial epicondyles; , radial fossa; , deltoid tuberosity; , intertubercular groove; , trochlea humeri; and , lesser and greater tubercle
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