Nervous tissue Flashcards
Nerve cells are called
neurons
Dendrites
(extension) impulses toward the cell body
Schwann cells
axons and dendrites wraps in special cells
Phospholipid insulates neurons from one another
myelin sheath
Phagocytes ( eat bacteria) ;constantly moving
Microglia
Contains the brain and spinal cord
Central Nervous System (CNS)
Oligodendrocytes (neuroglia)
found on the brain and spinal cord ,no Schwann cells present
small gap or space between. the axon of one neuron and dendrites or cell body
synapse
neurolemma
outside of myelin sheath ; important if nerves are damaged
What impulses from receptors to the CNS?
sensory neurons
What takes the impulse from the CNS to effectors (muscles and gland)?
motor
What supplies hips ,pelvic cavity and legs ?
lumbar and sacral
Phrenic C3-C5
Diaphragm
Radial C5-C8,T1
skin muscles ,forearm hand thumb & 1st 2 fingers
Median C5-C8,T2
anterior arm and forearm and hand
Ulnar C8,T1
medial arm , forearm , hand little finger and ring arm
Intercostal T2-T12
intercostal and abdominal muscles ,skin of trunk
Femoral L2-L4
anterior thigh , medial leg and foot
Sciatic L4-S3
posterior thigh leg and foot
meninges
vertebral canal; protect Brain and spinal cord
Where does the spinal cord extend from ?
forearm magnum and occipital bone to the 1st and 2nd lumbar vertebrae
What is the function and structure of gray matter ?
H- letter shaped :dorsal =horns enables individuals to control movement memory and emotions
What conducts, process, and send nerve signal up and down the spinal cord?
White matter (myelinated axons and dendrites interneurons )
Ascending
impulse to brain
Descending
impulses away from brain
What are the functions of the hypothalamus ?
- produce ADH ( kidney reabsorb H2o back into blood and maintains volume) & oxytocin(contraction uterus for L&D)
- releasing hormones GH stimulates anterior pituitary gland secret growth
- regulate body temp and food intake and body rhythms
- integration of ANS regulate organs
- stimulate visceral response during emotional situations
