Summary - ANA 152

PARTS OF A SPINAL NERVE:

 ARISE FROM SC AS ROOTLETS.

Rootlets join to from 2 nerve roots 1. Anterior(ventral) Root, contains motor fibers
2. Posterior(dorsal) Root, contains sensory fibers
Roots unite to form a mixed spinal nerve 1. Motor
2. Sensory
Divides immediately into 2 rami(branches) 1. Anterior(ventral) ramus
2. Posterior(dorsal) ramus


DIAGRAM OF FORMATION OF THE SPINAL NERVE

BRAIN & CRANIAL NERVES:
 Contains 3 meningeal layers:
1. DURA MATER- thick external fibrous.
2. ARACHNOID MATER- thin intermediate layer.
3. PIA MATER- delicate internal vaculated layer.

 Potential Spaces: Extra dural & Subdural space.
 True Spaces: Subarachnoid Space.
 BRAIN DIVIDED INTO 4 MAIN PARTS CEREBRUM, DIENCEPHALON, BRAINSTEM, CEREBELLUM(know positioning
from diag).



BRAINSTEM: Consists of MIDBRAIN, PONS, MEDULLA OBLONGATA.

Functions: Connects cerebrum to SC & cerebellum.
Contains nuclei of majority of cranial nerves & transmits ascending/descending tracts.

CEREBELLUM: Consists of Left & Right Hemispheres.

 2nd largest part of brain.
 Each hemisphere has narrow parallel
folds cold FOLIA.
 Connected to the brainstem.
Functions: Balance, muscle tone,
posture.

DIENCEPHALON: Lies between brainstem &
cerebrum.

 Located deep to cerebrum.
 Performs vital functions.
 3 main parts:
1. Thalamus
2. Hypothalamus
3. Epithalamus

CEREBRUM: Consists of Left & Right
Hemispheres.