Nerves and Spinal Cord

Satellite Cells belongs to which nervous system?

PNS

Schwann Cells belongs to which nervous system?

PNS

Satellite Cells belongs to which nervous system?

PNS

Schwann Cells belongs to which nervous system?

PNS

Astrocytes belongs to which nervous system?

CNS

Oligodendrocytes belongs to which nervous system?

CNS

Ependymal Cells belong to which nervous system?

CNS

What is responsible for maintaining blood brain and provides structural support?

Astrocytes

What is the equivalent to Astrocytes in PNS

Satellite Cells

What surrounds axons in PNS?

Satellite Cells

What allows Na in while letting K+ out?

NaK+ pump

T or F : 70 is the potential threshold

False. It’s 60

What are the two anatomical divisions of the nervous system?

Central Nervous System & Peripheral Nervous System

What does the CNS consists of?

The brain , spinal cord, blood vessels and connective tissues

What does the PNS consist of?

All nervous tissues outside of the Brain and Spinal Cord

The subdivisions of PNS are called

Somatic and Autonomic

Autonomic or ANS includes what?

Sympathetic and Parasympathetic and Enteric nervous system

What are the two functional divisions of the PNS?

Afferent and Efferent

What does Afferent Nervous System do?

Brings sensory information to the CNS

Where does the Afferent division get its information from?

Receptors in the peripheral tissues and organs

What does the Efferent division do?

Conus Medullaris

The cone-shaped terminal end of the spinal cord, located at the level of the 1st or 2nd lumbar vertebra.

cauda equina

A bundle of spinal nerves extending from the lower end of the spinal cord, resembling a horse’s tail.

filum terminale

fibrous extension of the pia mater that anchors the spinal cord to the coccyx.

What are the three meninges that protect the spinal cord?

Dura mater (outermost), arachnoid mater (middle), and pia mater (innermost).

What is the function of the central canal?

It contains cerebrospinal fluid (CSF) and runs through the center of the spinal cord.

What are the dorsal (posterior) horns?

Sections of gray matter that contain sensory neurons receiving signals from the body

What are the ventral (anterior) horns?

Sections of gray matter that contain motor neurons sending signals to muscles.

What are the three regions of white matter in the spinal cord?

Posterior funiculus, lateral funiculus, and anterior funiculus.

How many pairs of spinal nerves are there?

31

What are the four main nerve plexuses?

Cervical, brachial, lumbar, and sacral plexuses.

What is the function of the phrenic nerve?

It controls the diaphragm and plays a key role in breathing.

What does the brachial plexus innervate?

The muscles and skin of the upper limb (arm, forearm, hand).

Which nerve is the largest in the body and part of the sacral plexus?

The sciatic nerve.