A&P 1 Lab 9

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Which of the following branches of a spinal nerve has the somas of only sensory neurons?

Anterior (ventral) root Anterior ramus Meningeal Branch Posterior (dorsal) root*

spinal cord regions from superior to inferior

Cervical, Thoracic, Lumbar, Sacral, Coccygeal

spinal cord

Nerves that run up and down the length of the back and transmit most messages between the body and brain

The _________is the tapered end of the spinal cord.

conus medullaris

grey matter of spinal cord

deep

dorsal ramus

innervates skeletal muscles of the neck and back

phrenic nerve

innervates the diaphragm

sciatic nerve

largest nerve in the body

The ________lumbar region of the spinal cord gives rise to five pairs of spinal nerves.

lumbar

The ventral horn of the spinal cord contains cells bodies of

motor neurons

white matter

myelinated axons

A dorsal root ganglion contains cell bodies of

sensory neurons

Dorsal rami of spinal nerves innervate

skin and muscles of the back

ventral root

the basal branch of each spinal nerve; carries motor neurons

Simple spinal reflexes occur independent of the brain.

True or False TRUE

filum terminale

anchors spinal cord to coccyx

Cerebrospinal fluid fills the space between the _______

arachnoid mater and pia mater

Correctly label the following anatomical features of the spinal cord

Grey matter

cervical region

Know that it is in the lower half of the body.

Click and drag labels to identify the landmarks of the sympathetic nervous system.

Know this.

Which of the following is NOT considered a region of the spinal cord?

Lumbar Thoracic Sacral Pelvic*

Correctly label the following anatomical features of the spinal cord.

Meninges

peripheral nervous system Autonomic

-Involuntary -Lacrimal gland activation -Intestinal smooth muscle activation -Principally involved with movement of materials through the body -Sweat gland activation -Piloerector muscle activation -Can be excitatory on the target organ

peripheral nervous system Somatic

-Skeletal muscle activation -Principally involved with movement "of" the body

A simple spinal reflex typically involves how many neurons?

3

How many pair of spinal nerves are there?

31

Correctly label the following anatomical features of the spinal cord.

Posterior

A spinal nerve is formed by the union of

a dorsal and ventral root

Sensory stimuli enter the spinal cord via

afferent axons

dorsal root ganglion

cell bodies of sensory neurons

The _________region of the spinal cord gives rise to eight pairs of spinal nerves.

cervical

The anterior rami of the spinal nerves form nerve plexuses in all regions except the __________

cervical lumbar sacral thoracic*

Thoracic region

chest area

The __________is an extension of pia mater

filum terminale

Interneurons are located in the

spinal cord

conus medullaris

tapered end of spinal cord

The _______region of the spinal cord gives rise to twelve pairs of spinal nerves.

thoracic

Sensory receptors are found

throughout the body


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