Chapter 12: Neural Tissues Anatomy Flashcards
Central Nervous System (CNS)
Brain and Spinal Cord - INTEGRATION
Peripheral Nervous System (PNS)
Neural Tissues outsides the CNS. (Cranial nerves, spinal nerves, peripheral nerves, and receptors.)
Nervous System Overview
- Provides quick responses to stimuli
- Maintains Homeostasis
Nervous System Functions
- Sensory Input
- monitor stimuli - Integration
- process stimuli - Motor Output
- send reaction to stimuli
Classification of the PNS
- Sensory - Afferent division
- Motor - Efferent division
Collaterals
Branches
Sensory division of the PNS
Carries information to the CNS from sense receptors (input)
1. Somatic - from sense receptors in skin/muscle
2. Visceral - from sense receptors in organs
Somatic Nervous System (Motor)
Voluntary, towards skeletal muscles
Motor division of the PNS
Carries impulses away from the CNS towards effectors (Muscles and Glands) OUTPUT
Autonomic Nervous System (Motor)
Involuntary; towards smooth muscles, glands, and cardiac muscles.
Neuron Function
- Respond to stimuli
2.Conduct nerve impulses
Dendrites
Receive stimuli; receptive function
Axon
Conduct impulses; conductive function
Neurons Characteristics
- Amitotic
- High demand for o2 (only o2)
- Extreme longevity
Neuron Cell Body
Contains the nucleus
1. Biosynthetic system: rough ER, Mitochondria.
2. Ribosomes, neurofibrils
Axon Hillock
Initial segment; connection to cell body
Structural Classification of Neurons
- Anaxonic
2.Bipolar - Unipolar
- Multipolar