spinal nerves

(redirected from nervi spinales)
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spi·nal nerves

[TA]
the nerves emerging from the spinal cord; there are 31 pairs, each arising from the cord by rootlets that converge to form two roots, anterior (ventral or motor) and posterior (dorsal or sensory); the latter type is provided with a circumscribed enlargement, the spinal (dorsal root) ganglion; the two roots unite in the intervertebral foramen, and the mixed spinal nerve almost immediately divides again into anterior and posterior (primary) rami, the former supplying the anterolateral trunk and the limbs, the latter the true muscles and overlying skin of the back.
Synonym(s): nervi spinales [TA]

spinal nerves

the 31 pairs of nerves without special names that are connected to the spinal cord and numbered according to the level of the vertebral column at which they emerge. There are 8 cervical, 12 thoracic, 5 lumbar, 5 sacral, and 1 coccygeal pair. The first cervical pair of nerves emerges from the spinal cord in the space between the first cervical vertebra and the occipital bone. The rest of the cervical pairs and all the thoracic pairs emerge horizontally through the intervertebral foramina of their respective vertebrae, such as the second cervical pair, which emerges through the foramina above the second cervical vertebra. The lumbar, sacral, and coccygeal nerve pairs descend from their points of origin at the lower end of the cord before reaching the intervertebral foramina of their respective vertebrae. Each spinal nerve attaches to the spinal cord by an anterior (or ventral) root and a posterior (or dorsal) root. The nerve impulses enter the cord by way of posterior roots. The posterior roots supply skin and muscles of much of the body with some of the nerve fibers supplying autonomic functions. The posterior roots contain sensory neurons and accompany a distended spinal ganglion within the vertebral foramina. The ventral roots contain motor neuron axons. The sacral plexus in the pelvic cavity comprises certain spinal nerve fibers from the lumbar and sacral regions and gives rise to the great sciatic nerve in the back of the thigh. See also spinal cord.
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Spinal nerves and spinal column

spi·nal nerves

(spī'năl nĕrvz) [TA]
The nerves emerging from the spinal cord; there are 31 pairs, each attached to the cord by two roots, anterior and posterior, or ventral and dorsal; the latter is provided with a circumscribed enlargement, the dorsal root (spinal) ganglion; the two roots unite in the intervertebral foramen, and the mixed spinal nerve almost immediately divides again into ventral and dorsal primary rami, the former supplying the anterolateral trunk and the limbs, the latter the true muscles and overlying skin of the back.
Synonym(s): nervi spinales [TA] .

spinal nerves

The 31 pairs of combined MOTOR and sensory nerves that are connected to the spinal cord.

spi·nal nerves

(spī'năl nĕrvz) [TA]
The nerves emerging from the spinal cord; there are 31 pairs, each attached to the cord by two roots, anterior and posterior, or ventral and dorsal.
Synonym(s): nervi spinales [TA] .