اناٹومی مطالعاتی نوٹ · Back

Spinal nerves

31 pairs of mixed nerves attached to the spinal cord: 8 cervical, 12 thoracic, 5 lumbar, 5 sacral and 1 coccygeal.

اہم نکات

31 pairs: C8, T12, L5, S5, Co1.
Posterior root = sensory (with ganglion); anterior root = motor; spinal nerve and rami = mixed.
Spinal nerve → small posterior ramus (back) + large anterior ramus.
Cervical nerves exit above their vertebra; T/L/S exit below.
Greater occipital nerve = posterior ramus of C2.
Ventral root: basal-lamina neurons. Dorsal root: neural-crest ganglion cells.
Schwann cells: neural crest.
Dorsal root ganglion: pseudounipolar neurons, no synapses.
Nerve: epineurium → perineurium (blood–nerve barrier) → endoneurium.

خصوصیات · Course · Histology · Development · طبی اہمیت

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