CMD 377 Lecture Notes - Lecture 18: Ventral Posterolateral Nucleus, Medial Lemniscus, Sulcus Limitans
Document Summary
Anatomically segmented 31 segments: 8 cervical, 12 thoracic, 5 lumbar, 5 sacral, 1 coccygeal. Examples of structures (cauda equina, enlargements, dentate ligament, internal structure anterior & posterior horns, body) Filament that courses through l1-s2 cauda equina (in the lumbar cistern: collection of dorsal and ventral roots. Contains motor neurons supplying upper extremities: lumbar englargment. Pia mater thick: gives rise to the dentate ligament: anchors the spinal cord to the arachnoid and dura. White matter divided into funiculi: anterior median fissure, posterior median sulcus, posterolateral sulcus. Where dorsal rootlets enter the spinal cord: anterolateral sulcus. Where ventral rootlets exit the spinal cord. Consists of interneurons and projection neurons that collect into ascending sensory pathways. Located at the tip of the gray matter. Deals with sensory fibers that carry pain and temperature: anterior horn information. Contains cell bodies of large motor neurons that supply skeletal muscle. Destruction or interruption of lower motor neurons complete paralysis of involved muscles: intermediate gray matter.
