Lecture 7_Updated Flashcards
What segments of the spinal cord contain the lateral horn?
T1-L2; S2-4 ONLY
What type of neuron cell bodies are found in the dorsal root ganglia?
Sensory neurons (Pseudounipolar)
How do afferent fibers exit the ganglion? Where do afferent fibers synapse?
Dorsal rootlets
Dorsal Horn
What type of neuron cell bodies are found in the ventral horns?
Somatic motor neurons
How do efferent neurons exit the spinal cord?
As ventral rootlets (unite to form ventral root)
True or False: Dorsal Rootlets and Dorsal Root Ganglia are on the same side while Ventral Rootlets and Ventral Root are on opposite sides
True
How do pre-ganglionic visceromotor fibers exit the spinal cord?
Via ventral rootlets
How do pre-ganglionic fibers from the lateral horn join the spinal nerve?
Ventral root
The pre-ganglionic neurons in the lateral horn travels via the ____ to reach the chain ganglia (T1-L2)
white rami communicans
How do post-ganglionic fibers return to the spinal nerve?
Via grey rami communicans
True or False: There are 31 pairs of spinal nerves, all of which contain both motor and sensory fibers
True
What type of matter contains myelinated axons/glial cells AND has funiculi (anterior, posterior, and lateral) and anterior white commisure?
White matter
What type of matter contains neuronal cell bodies and contains grey commisure and horns (ventral, lateral, and dorsal)?
Grey matter
Which grey matter horn contains the cell bodies of sympathetic neurons and visceromotor fibers?
Lateral Horn
Which horn contains the cell body of interneurons and axons of sensory neurons?
Dorsal Horn
True or False: The central canal contains CSF and is a remnant of neural tube
True
____ nerves exit ABOVE named vertebrate, while all other spinal nerves emerge below named vertebrate
Cervical
____: area of skin that a single nerve innervates
____: muscles a single spinal nerve innervates
Dermatome
Myotome
The Cervical Plexus ranges from ___ while the Brachial Plexus ranges from ____
Cervical plexus: C1-5
Brachial plexus: C5-T1
The Lumbar Plexus ranges from ____ while the Sacral Plexus ranges from _____
Lumbar plexus: L1-4
Sacral plexus: L4-S4
Which plexus innervates the posterior head, neck, and diaphragm?
Which plexus innervates the pelvic, gluteal, posterior thigh, leg/foot?
Cervical Plexus
Sacral Plexus
Which plexus innervates abdominal, pelvic, anterior/medial thigh?
Which plexus innervates the shoulder, axilla, and upper limbs?
Lumbar Plexus
Brachial Plexus
True or False: Ventral rami in cervical region form cervical and brachial plexuses
True
____ Ventral Rami does not form plexus
Thoracic
T1 splits into ___ and ____
brachial plexus (large) and 1st intercostal nerve (small)
T2-T6 innervates which nerve?
T7-11 innervates which nerve?
T12 innervates which nerve?
T2-6: 2-6th intercostal nerve
T7-11: Thoracoabdominal nerve
T12: Subcostal nerve
How are spinal nerves formed?
Union of dorsal and ventral roots
What two branches do spinal nerves form?
1) Dorsal Rami
2) Ventral Rami
Which spinal nerve division send motor signals to the deep back muscles and receives sensory info from those muscles?
Dorsal Rami
Which rami (ventral or dorsal) branches to form plexuses?
Ventral Rami
Where does a lumbar puncture occur?
Lumbar cistern (L3-4)
Where does C1 exit?
Where does C8 exit?
C1: Between occipital/atlas
C8: Between C7 and T1
S1-4 divide into ___ and ___ rami while still inside the sacral canal
ventral; dorsal
S5 innervates which nerve?
Coccygeal nerve (sacral hiatus)
True or False: T1 nerve co-emerge inferior to pedicles of respective vertebrate
True
True or False: The vertebral column and dura lengthen slower than the neural tube
False - the vertebral column and dura lengthen faster than the neural tube
Where does the spinal cord end in a newborn vs. adult?
Newborn = L3-4
Adult = L1-2
What two specialized pia structures help anchor and protect the spinal cord?
Denticulate ligaments and Filum Terminale
What structure connects outer dura with inner pia mater?
Arachnoid trabeculae
____: Potential space between dura and arachnoid
Subdural space
_____: space between arachnoid and pia; contains CSF
Subarachnoid space
_____: theoretical space between dura and vertebral wall, contains internal vertebral plexuses, epidural fat, and dura mater
Epidural space
The Posterior Median Sulcus contains ___ while the Posteriolateral Sulcus contains ____
Posterior Median Sulcus = posterior spinal vein
Posteriolateral Sulcus = posterior spinal arteries
The Anterior Longitudinal (Median) Fissure contains _____ and is lined by the linea splendens
Anterior spinal artery
True or False: White Matter contains neuronal cell bodies
False - gray matter contains neuronal cell bodies
