Spinal Cord and Spinal Nerves

Unit 4, Lab 15

Location of Conus Medullaris

L1 or L2 vertebrate

Composition of Cauda equina

Spinal roots

What forms Filum terminale

Pia mater

Contained in Subarachnoid space

Cerebrospinal fluid (CSF)

Function of Spinal nerve

Carries sensory and motor information

Function of Posterior rootlets & posterior root / Anterior rootlets & anterior root

Carries sensory information

Function of Posterior ramus / Anteiror ramus

Carries sensory and motor information

Function of Posterior root ganglion

Contains cell bodies of sensory unipolar neurons

Function of Gray matter

Contains cell bodies, dendrites, and interneurons

Function of White matter

Contains myelinated axons

Function of Central canal

Contains cerebrospinal fluid (CSF) coming from the fourth ventricle

Motor innervation of Phrenic nerve (C3-C5)

Diaphragm

Motor innervation of Median nerve (C5-T1)

Anterior forearm compartment muscles, except for the medial muscles

Sensory innervation of Median nerve (C5-T1)

Lateral 2/3 of hand on ventral side; dorsum of fingers 2 & 3

Motor innervation of Ulnar nerve (C8-T1)

Flexor carpi ulnaris; medial half of flexor digitorum profundus

Sensory innervation of Ulnar nerve (C8-T1)

Medial third of hand; anterior and posterior

Motor innervation of Musculocutaneous nerve (C5-C7)

Anterior compartment of the arm

Sensory innervation of Musculocutaneous nerve (C5-C7)

Lateral forearm

Motor innervation of Axillary nerve (C5-C6)

Deltoid, teres minor

Sensory innervation of Axillary nerve (C5-C6)

Shoulder joint; skin over part of the deltoid

Motor innervation of Radial nerve (C5-T1)

Posterior arm and forearm compartments

Sensory innervation of Radial nerve (C5-T1)

Posterolateral arm and hand, except dorsum of fingers 2 & 3

Motor innervation of Femoral nerve (L2-L4)

Anterior thigh muscles

Sensory innervation of Femoral nerve (L2-L4)

Anterior and medial thigh; hip and knee joints; skin of medial leg and foot

Motor innervation of Obturator nerve (L2-L4)

Medial thigh muscles

Sensory innervation of Obturator nerve (L2-L4)

Medial thigh; skin over hip and knee joints

Motor innervation of Tibial nerve (L4-S3)

Posterior thigh and posterior leg muscles

Sensory innervation of Tibial nerve (L4-S3)

Posterior leg and sole of foot

Motor innervation of Common fibular (peroneal) nerve (L4-S3)

Short head of biceps femoris; lateral and anterior leg muscles

Sensory innervation of Common fibular (peroneal) nerve (L4-S3)

Skin of anterior and lateral surface of leg; dorsum of foot

Contained in Vagus nerve (CN X)

Parasympathetic innervation to 80% of the body

Function of Vagus nerve (CN X)

Sensory for taste from epiglottis and pharynx and general sensation in the oral cavity; motor to larynx