A&P Spinal Cord, Spinal Nerves, & Meninges

In the spinal cord cross section, the posterior ____ of the gray matter resemble the upper wings of a butterfly.

horns

The gray matter of the spinal cord is divided into anterior, lateral, and posterior ____.

horns

Spinal nerves L4 through S4 form a ____ plexus.

sacral

Epidural space

separates dura mater from bone of vertebra or skull

Arachnoid mater

thin, weblike middle membrane

The spinal cord gives rise to 31 pairs of ____.

spinal nerves

The motor neurons are found in the ____ roots of spinal nerves.

anterior

Cervical spinal nerve pair C1 originates between the occipital bone and the ____.

atlas

Filum terminale

inferior continuation of pia mater to the coccyx

The ____ is a groove that extends the length of the spinal cords posteriorly.

posterior median sulcus

There are ____ pairs of the cervical nerves.

31

There are ____ pairs of sacral spinal nerves.

5

The ____ in the gray commissure of the spinal cord contains cerebrospinal fluid and is continuous with the cavities of the brain.

central canal

The bulge in the spinal cord that gives off nerves to the upper limbs is called the ____ enlargement.

cervical

Denticulate ligaments

connections from pia mater to dura mater that anchor the spinal cord

Subarachnoid space

contains cerebrospinal fluid

The white matter of the spinal cord is divided into anterior, lateral, and posterior ____.

funiculi

The ____ connects the gray matter on the left and right sides of the spinal cord.

gray commissure

The bulge in the spinal cord that gives off nerves to the lower limbs is called the ____ enlargement.

lumbar

Dura mater

outermost layer of meninges