Dorsal Primary Rami and Ventral Rami Flashcards
What do the dorsal rami supply?
POSTERIOR BODY TRUNK \+ BACK OF HEAD \+ INTRINSIC BACK/ NECK
Which intrinsic back muscles are supplied by the dorsal rami?
(5)
SACROSPINALIS aka ERECTOR SPINAE \+ DEEP PARASPINALS aka TRANSVERSOSPINALIS \+ SPLENIUS CAPITIS \+ SPLENIUS CERVICES \+ SUBOCCIPITALS
Through most of the trunk, how does the sensory distribution of dorsal primary rami appear?
REGULAR SEGMENTAL BANDS
Where are clunial sensory distributions found?
BUTTOCKS
What do the ventral rami supply?
LATERAL and ANTERIOR TRUNK
+
UPPER and LOWER EXTREMITIES
Most thoracic ventral rami (T2-T11) arise from what?
SINGLE ROOT SEGMENT
in
REGULAR SEGMENTAL BANDS
The ventral rami and the ____________ nerves are the same structure.
INTERCOSTAL
Axons in the ventral rami which serve upper/lower extremities mix and mingle to form nerve networks called what?
PLEXUSES
think braid
Post plexuses serving the upper and lower extremity usually contain fibers from more than 1 nerve - why is this awesome?
MM INNERVATED BY MULTIPLE SPINAL NERVES CAN OFTEN RETAIN FUNCTION IF ONE NERVE IS DAMAGED
Only __________ rami form plexuses.
VENTRAL
Name the plexus found in the lower cervical and upper thoracic region?
BRACHIAL PLEXUS
Name the plexus found in the lumbar and sacral regions?
LUMBOSACRAL PLEXUS
A lesion where, will make you lose afferent input?
DORSAL ROOT
A lesion where, will make you lose efferent motor output?
VENTRAL ROOT
A lesion in any of which 3 places will make a person lose afferent and efferent signals?
SPINAL NERVE \+ DORSAL RAMUS \+ VENTRAL RAMUS
