unit 7: sympathetic, sympathetic trunk Flashcards
CB of preganglionic neurons are located in the LAT horn of cord levels __-__ or __ before exiting the cord in __ rootlets
-release ACH
T1-L2
3
anterior
preganglionic neurons follow the _ _ _ and exit that to enter the sympathetic trunk via the _ _ _ to synapse on postganglionic cells in ganglia of symp trunk
APR
white ramus communicans (WRC)
some preganglionic fibers pass THRU the symp trunk to be carried in ___ nerves to synapse in prevertebral plexus assoc w/ ___ viscera
splanchnic
abdominopelvic
the symp trunk is composed of two paravertebral columns of interconnected ganglia that carry ascending and descending fibers, and extends from the __ __ ganglion inferior to __ ___
superior cervical
ganglion impar
usually are 21 or 22 ganglia in each trunk, usually: \_\_ cervical \_\_ thoracic \_\_ lumbar \_\_ sacral
3
11
4
4
- symp trunk is located posterior to the __ __ (C) and anterior to the necks of the ribs (UT)
- move more medially located inferiorly, on the __ aspect of the VB (LT & L)
- trunks lie on anterior aspect of ___, and will join at level of coccyx
carotid sheath
lateral
sacrum
the ___ sympathetic trunk lies bt the carotid sheath & longus colli and capitis
cervical
the cervical symp trunk has no WRC, but a ___ goes to each cervical nerve
GRC
there are three cervical ganglia, sup, middle & inferior, which may fuse with first THORACIC ganglion to form the __ganglion
stellate
the largest cervical symp ganglion is the __, while the smallest is the __
superior
middle
the sup cervical ganglion (SCG) are formed by the union of the upper 4 cervical ganglia and is located at __-__ bt carotid sheath & __ __ muscle
C2-C3
longus capitis
the ___ fibers of the SCG are distrib in anterior, medial, or lateral branches
postganglionic
the LATERAL SCG branches are the GRC, and communicate w/ APR of __-__ and some cranial n (IX, X, XII)
C1-C4
MEDIAL SCG travel to the larynx, pharynx & heart
-heart branches are the __ __ nerves, which carry ___ info only
superior cardiac
efferent
ANTERIOR SCG branches follow the __ & __ carotid arteries, innerv vessels that supply blood to struct inside and outside the __
common
external
skull
the MIDDLE cervical ganglia (MCG) are located at the level of C6 & communicates with the APR of __ and __ nerves via the GRC
C5 & C6
in the MCG, __ branches reach the thyroid & parathyroid glands, and are primarily __ in function
thyroid
vasomotor
in the MCG the __ branches make up the middle cardiac nerves and contribute to the DEEP part of the __ __
cardiac
cardiac plexus
the INFERIOR cervical ganglia (ICG) lies at the level of C7 TVP and neck of first rib, and communicates with the APR of __ & __ (sometimes T1 if fused) via GRC
C7 & C8
cardiac branches of the ICG travel to heart as __ __ nerves, while others are sent to the __ artery to form plexuses around it and its branches (axillary and vertebral a)
inferior cardiac
subclavian
all 12 ___ nerves have a GRC and WRC
thoracic
in the SUP thorax, ganglia are ___ to rib heads, in lower thorax, ganglia are on the ___ aspects of VB
anterior
lateral
branches from the __ __ thoracic ganglia travel medially carrying postganglionic fibers and visceral ___ to supply thoracic cavity struct
upper five
afferents
three ___ nerves are associated with the lower 7 segments of the thoracic sympathetic trunk, carrying __ fibers & visceral afferent info to plexuses in the abdom & pelvic cavities
splanchnic
preganglionic
