Section Lab Exercise 14-5 Anterior Rami of the Spinal Nerves: Locations and Func

Question

Section Lab Exercise 14-5 Anterior Rami of the Spinal Nerves: Locations and Functions The anterior rami of the spinal nerves (with the exception of the intercostal nerves) can be traced to the specific nerve plexus from which they originate. Fill in Table 14.2 with the nerve plexus from which each nerve originates and the functions of each nerve. Use your text and Exercise 14-3 (p.375) in this unit for reference. TABLE 14.2 Selected Anterior Rami of the Spinal Nerves Spinal Nerve Nerve Plexus Functions Phrenic nerve Radial nerve Ulnar nerve Median nerve Femoral nerve Obturator nerve ibial nerve mmon fibular nerve Peripheral and Autonomir Nenvou Surt

Explanation / Answer

nerve

plexus

function

Phrenic nerve

Cervical Plexus

it is vital for breathing as passes motor information to diaphragm and receives sensory information from it and hence plays a role in diaphragm contraction during breathing

Radial nerve

Brachial plexus

Controls the movement of the triceps muscle of the forearm as it supplies nerves to it as well as muscles in the posterior osteofascial compartment of the forearm. extending the wrist and fingers is also a function of the nerve .it also controls sensation in parts of hands

Ulnar nerve

Brachial Plexus

As it supplies nerves to anterior compartment of the forearm, and in the hand, it is mainly responsible for the hand movement(flex of fingers as well as wrist)

Median nerve

Brachial Plexus

As it innervates many muscles along the entire length of the arm, it mainly Serves the flexors of hand and forearm

Femoral nerve

Lumbar Plexus

Being the largest nerve in the leg, it controls the muscles that help straighten the leg and in hip movement. It also responsible for sensation in lower part of the leg and the front of thigh

Obturator nerve

Lumbar Plexus

It provides sensation to the skin on the medial side of the thigh.it also provides for the motor functions of the hip and knee joints and the abductor muscles.

Tibilal nerve

Sacral Plexus

Supplies nerve to the muscles of the lower leg and the foot .as it innervates all the muscles in the posterior compartment of the leg.it is crucial for toe and ankle flexes

Common fibular nerve

Sacral Plexus

In the lower leg common fibular nerve provides for sensation and motor functions.they are also responsible for supplying nerves to muscles in the legs which lift the ankle and toes upward

nerve

plexus

function

Phrenic nerve

Cervical Plexus

it is vital for breathing as passes motor information to diaphragm and receives sensory information from it and hence plays a role in diaphragm contraction during breathing

Radial nerve

Brachial plexus

Controls the movement of the triceps muscle of the forearm as it supplies nerves to it as well as muscles in the posterior osteofascial compartment of the forearm. extending the wrist and fingers is also a function of the nerve .it also controls sensation in parts of hands

Ulnar nerve

Brachial Plexus

As it supplies nerves to anterior compartment of the forearm, and in the hand, it is mainly responsible for the hand movement(flex of fingers as well as wrist)

Median nerve

Brachial Plexus

As it innervates many muscles along the entire length of the arm, it mainly Serves the flexors of hand and forearm

Femoral nerve

Lumbar Plexus

Being the largest nerve in the leg, it controls the muscles that help straighten the leg and in hip movement. It also responsible for sensation in lower part of the leg and the front of thigh

Obturator nerve

Lumbar Plexus

It provides sensation to the skin on the medial side of the thigh.it also provides for the motor functions of the hip and knee joints and the abductor muscles.

Tibilal nerve

Sacral Plexus

Supplies nerve to the muscles of the lower leg and the foot .as it innervates all the muscles in the posterior compartment of the leg.it is crucial for toe and ankle flexes

Common fibular nerve

Sacral Plexus

In the lower leg common fibular nerve provides for sensation and motor functions.they are also responsible for supplying nerves to muscles in the legs which lift the ankle and toes upward

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