Exam 3 Study Guide Spinal Cord and Nerves

What does “Innervate” mean?

To supply a body part with nerves.

Think: “What body part does this nerve connect to/control or give sensation to?”

Innervate

Know the order of the meninges, (start from outside and into the brain/spinal cord)

1. Dura mater

2. Arachnoid mater

3. Pia mater

Know the order of the meninges:

1. Dura mater

2. Arachnoid mater

3. Pia mater

Subarachnoid Space

Space between Arachnoid Mater and Pia Mater

Filled with Cerebrospinal Fluid (remember what the CSF does?)

Subarachnoid Space

Epidural Space

Space between bone and meninges

Filled with adipose connective tissue (remember the function of adipose?)

Epidural Space

What are the Ascending signals for the anterior column, lateral column, and posterior column?

Ascending signals for senses

Ascending signals for senses

What are the descending signals for the anterior column and lateral column?

Descending motor signals

Descending motor signals

The Anterior Root carries ???axons from the ??? to the ??? . 

Motor

Brain

Body

Anterior Root

The Posterior Root carries axons from the to the . 

SENSORY

BODY

BRAIN

Posterior Root

The Anterior  Ramus carries and  axons to and .

MOTOR

SENSORY

LIMBS

ANTERIOR TRUNK

Anterior Ramus

The Posterior Ramus carries and axons to the of the .

MOTOR

SENSORY

BACK

BODY

Posterior Ramus

What is a Plexus?

Bundle of Nerves

Bundle of Nerves

What does the Phrenic Nerve Innervate?

Innervates the diaphragm muscle

Innervates the diaphragm muscle

What does the Axillary Nerve Innervate?

Innervates the Deltoid and Teres Minor muscles

Innervates the Deltoid and Teres Minor muscles

What does the Musculocutaneous Nerve Innervate?

Innervates the anterior muscles of the arm, biceps brachii, brachialis, and coracobrachialis

Innervates the anterior muscles of the arm, biceps brachii, brachialis, and coracobrachialis

What does the Radial Nerve Innervate?

Innervates the triceps brachii, brachioradialis, and the forearm extensor muscles

Innervates the triceps brachii, brachioradialis, and the forearm extensor muscles

What does the Median Nerve Innervate?

Innervates the forearm flexors and thenar group muscles

Innervates the forearm flexors and thenar group muscles

What does the Ulnar Innervate?

Innervates the flexor carpi ulnaris and hypothenar group muscles

Innervates the flexor carpi ulnaris and hypothenar group muscles

What does the Femoral Nerve Innervate?

Innervates the sartorius and quadriceps femoris muscles

Innervates the sartorius and quadriceps femoris muscles

What does the Obturator Nerve Innervate?

Innervates the adductor muscles of the medial thigh

Innervates the adductor muscles of the medial thigh

What does the Tibial Nerve Innervate?

Innervates the posterior leg muscles and the plantar muscles of the foot

Innervates the posterior leg muscles and the plantar muscles of the foot

What does the Common Fibular Nerve Innervate?

Innervates the anterior and lateral leg muscles

Innervates the anterior and lateral leg muscles

What does the Sciatic Nerve Innervate?

Innervates the hamstring muscles of the posterior thigh

Innervates the hamstring muscles of the posterior thigh