Spinal Cord Morphology Flashcards
What are the spinal cord segments for the deep reflex motor dermatomes? Biceps brachii Brachialis Triceps brachii Muscles of hand Quadriceps femoris muscle Gastrocnemius muscle
C5-6 C6-7 C6-8 C8-T1 L2-4 L5-S2
What are the spinal cord segments for the superficial reflex motor dermatomes? Scapular Epigastric Abdominal Cremasteric Superficial anal
C5-T1 T7-9 T8-12 L1-2 S4-Co1
What singular artery is located deep in anteromedian sulcus and supplies most of the central gray matter and anteromedial portion of white matter of spinal cord?
Anterior spinal artery
Disruption of blood flow to what artery results in central cord syndrome, an ischemia of central region of spinal cord?
Anterior spinal artery
What course in the postero-lateral sulci of each side of the cord and supply about 75% of posterior columns? These along with radicular arteries supply peripheral margins of the cord
Posterior spinal arteries (2)
What artery usually arises from left inferior intercostal or superior lumbar arteries and contributes to anterior spinal artery? It is the major supply to inferior two-thirds of spinal cord
Anterior artery of Adamkiewicz
What artery may be compromised secondary to thoracolumbar fracture or surgical repair of abdominal aortic aneurysms (AAA)?
Anterior artery of Adamkiewicz
Where does ischemic necrosis of the spinal cord most frequently occur?
Adjacent to enlargements at C2-3, T1-4, L1
What is the net result of the gamma efferent pathway?
Alteration in muscle tone and reflexes and maintenance of accurate proprioceptive (position-sense) output from neuromuscular spindles
Describe the gamma efferent pathway
Supraspinal influences
Gamma efferent neuron (intrafusal fiber of NMS)
Ia efferent neuron
Interneuron alpha motor neuron
Motor end plate
Describe the location and function of the substatia gelatinosa (SG). Where does it send fibers to?
Location: posterolatearl tip of dorsal horn at all spinal levels
Function: pain/temperature pathway
Sends fibers to: Lateral spinothalamic tract (LSTT)
Describe location and function of nucleus proprius (NP). Where does it send fibers to?
Location: midportion of dorsal horn
Function: pain/temperature pathway
Sends fibers to: fasciculus proprius
Describe location and function of nucleus dorsalis (Clarke’s column). Where does it send fibers to?
Location: base of dorsal horn from C8-L2
Function: unconscious proprioceptive pathway
Sends fibers to: dorsal spinocerebellar tract
Describe location and function of visceral afferent nucleus. Where does it send fibers to?
Location: T1-L2 and S2-4
Function: visceral sensory integration relex center
Sends fibers t: intermediolateral gray, ventral horn, and hypothalamus via fasciculus proprius (RF)
Describe location and function of intermediate gray. Sends fibers to?
Location: between dorsal and ventral horns at all spinal levels
Function: sensorimotor integration center
Sends fibers to: ventral horn