Spinal Nerve Organization and Reflexes

These flashcards cover key concepts related to spinal nerve organization, nerve plexuses, and various reflexes.

Motor axons originate from the __.

spinal nerve

The __ root contains the motor axons exiting from the spinal cord.

ventral

Cell bodies are found in the and horns of the spinal cord.

ventral; lateral

Sensory axons enter the spinal cord via the __ aspect.

dorsal

The __ root contains the short central axons of sensory neurons.

dorsal

The __ root ganglion houses the cell bodies of the sensory neurons.

dorsal

Spinal nerves form from the convergence of the dorsal and __ roots.

ventral

Rami are distal to the spinal nerve and are formed by branches of the __.

spinal nerves

The __ ramus innervates the deep muscles of the back & the skin of the back.

dorsal

The anterior rami of the thoracic nerves are termed __ nerves.

intercostal

A __ is an area of skin supplied with sensory information by a pair of spinal nerves.

dermatome

A __ is the muscles that a particular spinal nerve innervates.

myotome

Nerve plexuses arise from the interweaving of the __ rami of the spinal nerves.

anterior

The __ nerve is a key nerve in the cervical plexus that innervates the diaphragm.

phrenic

The __ nerve of the brachial plexus innervates the deltoid.

axillary

The __ reflex is a monosynaptic reflex that monitors and regulates muscle length.

stretch

The Golgi tendon reflex is __ and prevents excessive contraction in response to increased tension.

polysynaptic

The __ reflex is initiated by a painful stimulus causing a flexor muscle to contract.

withdrawal (flexor)

The __ reflex occurs in conjunction with the withdrawal reflex and extends the opposing limb.

crossed-extensor