Nervous System

lecture 5

Neuron

The structural and functional unit of the nervous system

another term for the cell body of a neuron

Soma

Processes of a neuron are the …………….

axon and dendrites

What is the CNS made of?

Brain & Spinal Cord

What is the PNS made of?

• Cranial Nerves (12 pairs)

• Spinal Nerves (31 pairs)

• Their Ganglia

The brain and spinal cord are found along the ________ plane of the body.

Midsagittal

The brain is protected in the ______ cavity, while the spinal cord is protected in the ______ cavity.

1. Cranial

2. Vertebral

The 3 layers of the meninges are:

1. Dura Mater
   Arachnoid Mater
   Pia Mater

Features of the Dura Mater.

• Thickest layer

• Strongest layer

• Most Superficial layer

Features of the Pia Mater.

• Thinnest layer

• Most delicate layer

• Deepest layer

Which meninges layer has direct contact with the surface of the CNS?

Pia Mater

What is the Subarachnoid Space?

The space between the arachnoid mater and pia mater

What’s inside the Subarachnoid Space?

• Cerebrospinal Fluid (CSF)

• Blood Vessels (supply the brain & spinal cord)

• Connective tissue strands (arachnoid trabeculae)

What are the meninges?

The meninges are the 3 protective membranes that surround and protect the brain and spinal cord.