Nervous System Flashcards
Somatic Nervous System
Under voluntary control–sensory and motor–innervate skeletal muscle–consists of afferent and efferent nerves
Intercostal nerves
arise out of the ventral rami from the thoracic rami
Types of intercostal nerves and related areas
intercostal spaces, lateral branches, anterior branches, intercostobrachial nerve, subcostal nerves
Somatic Nervous System
provides sensory and motor innervation to all parts of the body EXCEPT VISCERA IN THE BODy CAVITIES SMOOTH MUSCLE, AND GLANDS
Somatic sensory system, also called
somatosensory: transmits sensations of touch, pain, temperature, and position from sensory receptors
Somatic motor system
innervates only skeletal muscle, stimulating voluntary and reflexive movement by causing the muscle to contract, as occurs in response to touching a hot iron
Somatic Sensory/Somatic Motor/Visceral Sensory/Visceral Motor: where do they go in the spine
Somatic sensory and visceral sensory go to the dorsal (posterior) root; the other two go through the ventral root
Sympathetic Trunk
Visceral Motor (autonomic)
Sympathetic (fight or flight)
gray and white rami communicantes
Intercostobrachial nerve
T2: has a branch the runs the axillary region, runs down the torso from intercostal nerve
T2
Intercostobrachial nerve
Spinal nerve plexuses
network of interweaving anterior rami of spinal nerves
anterior rami of most spinal nerves form these plexuses on right and left sides of the body
from these plexuses nerves diverge into “named” nerves that innervate specific structures
principle plexuses are the cervical plexus, brachial plexus, and lumbar and sacral plexuses
Cervical Plexus
primarily in neck and upper torso
Brachial Plexus
shoulder upper limb
lumbar plexus
works with sacral plexus
primarily pelvis, lower limb, lower abdomen, gluteal region
sacral plexus
works with lumbar plexus
primarily pelvis, lower limb, lower abdomen, gluteal region
