THE ARM and HUMERUS

The arm is that portion of the upper extremity which is situated between the shoulder and the elbow. Its skeleton consists of a single bone, the humerus.

The HUMERUS

The Humerus is the longest and largest bone of the upper extremity; it presents for examination a shaft and two extremities.
The Upper Extremity presents a large, rounded head, joined to the shaft by a constricted portion, called the neck, and two other eminences, the greater and lesser tuberosities.
The head, nearly hemispherical in form/ is' directed upward, inward, and alittle backward, and articulates with the glenoid cavity of the scapula; its surface is smooth and coated with cartilage in the recent state. The circumference of its articular surface is slightly constricted, and is termed the anatomical neck, in contradistinction to the constriction which exists below the tuberosities. The latter is called the surgical neck, from its often being the seat of fracture.

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The Fifth Nerve

The Fifth or Trifacial Nerve (n. trigeminus) is the largest cranial nerve. It resembles a spinal nerve (1) in arising by two roots; (2) in having a ganglion developed on its posterior root; and (3) in its function, since it is a compound nerve. It is the great sensory nerve of the head and face and the motor nerve of the muscles of mastication. Its upper two divisions are entirely sensory; the third division is partly sen.sory and partly motor. It arises by two roots: of these the anterior is the smaller, and is the motor root; the posterior, the larger and sensory. Its superficial origin is from the side of the pons Varolii, nearer to the upper than the lower border. The smaller root consists of three or four bundles; the larger root consists of numerous bundles of fibres, varying in number from,seventy to a hundred. The two roots are separated from one another by a few of the transverse fibres of the pons. 'I'he deep origin of the larger or sensory root is chiefly from a ...

Humans Body Parts Informations

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