A&PII lecture midterm study guide

Name components of CNS and PNS, compare compositions and functions of grey & white matter.

CNS: Brain & spinal cord; integration & command center. PNS: Paired spinal and cranial n.; carries msgs to/from CNS. PNS consists of sensory (afferent) and motor (efferent) division.

Define Nucleus

cluster of n. cell bodies in the CNS

Define Ganglion

cluster of nerve cell bodies outside the CNS

Define Nerve

a bundle of axons in PNS

Define Nerve Tract

a collection of axons in the CNS having the same origin, termination, and function

Define Cephalization

the embryonic development of brain and head

Breifly describe embryonic development of the brain: name & identify main components of forebrain, midbrain, hindbrain.

Ectoderm thickens and forms neural plate, neural plate forms neural groove, neural groove fuses dorsally and forms the neural tube. Anterior —> Brain; Posterior—> spinal cord.

Define basal nuclei and its function

massses of grey matter found deep within cortical white matter. It influences m. activity, regulates attention and cognition, intensity of slow movements, inhibits antagonistic and unnecessary movement

Define Cortex

Define gyrus

Define sulcus & fissure

Name the structure that binds the R and L hemispheres

what does motor homunculus represent?

compare primary corteses with association corteses for: somatosensory, visual, auditory, olfactory, gustatory, vestibular.

Name and explain three types of fibers found in the CNS.