Lecture 9 Flashcards Preview

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Flashcards in Lecture 9 Deck (16):
1

Types of Muscle Fibers

Skeletal (voluntary), Cardiac (involuntary), Smooth (involuntary)

2

CNS

Central Nervous System. Consists of brain and spinal cord. integrates and evaluates sensory info. generates response

3

PNS

Peripheral Nervous System. Cranial nerves (originate from brain) spinal nerves (originate from spinal cord.

4

Afferent Pathway

Incoming (sensory)

5

Efferent Pathway

Outgoing (motor)

6

SNS

Somatic Nervous System. Voluntary and conscious, controls skeletal muscles (somatic effectors) (afferent and efferent)

7

ANS

Autonomic Nervous System. Involuntary, subconsious. controls smooth, cardiac muscle and glans
Afferent pathway= (visceral) sensory division
Efferent= 2 divisions, 1. sympathetic: -threat response, fight-or-flight. 2. parasympathetic: resting states, rest and repair

8

Glia (neuroglia

cells that help support neurons

9

Astrocytes

(In CNS) star shapes, largest & most numerous type of glia, transfer nutrients from blood to the neurons, form tight sheaths around brain capillaries (blood-brain barrier)

10

Microglia (in CNS)

small, stationary, dormant cells. can enlarge, move about, and perform phagocytosis, triggered by tissue degeneration and inflammation.

11

Ependymal Cells

Resemble epithelial cells in both structure and function. grow in thin sheets that line the fluid-filled cavities. secretory and ciliated.

12

Oligodendrocytes

form myelin sheath around nerve fibers in the CNS

13

Schwann Cells (neurolemmocytes)

Form myelin sheath around nerve fibers in the PNS

14

Myelin

Lipoprotein. Aids in Nervous Transmission.

15

Unmyelinated fibers

bundles of nerve fibers collectively held together by myelin (AKA Grey matter)

16

Myelinated fibers

each axon is individually myelinated (AKA white matter)