Spinal Cord Anatomy

  The spinal cord has a enlargements the cervica and the lumbo sacral The neural tube becomes the CNS and the neural crest outside neural tube becomes the PNS 3 membranes surround the CNS the dura mater outer arachnoid middle and pia mater inner Between roots of spinal nerves the pia extends through the arachnoid and anchors to the dura t this is called the denticulate ligaments the pia mater and arachnoid are separated by the subarachnoid space filled with Sf The epidural space above dura is filled with fat Epidural lumbar Denticulate mater punctures take ligament Yagura Dura mater place between the spinal nerve 1st t 2nd coccygeal Edt nter vertebral araggq.ge Each spinal cord segment correspovernotorg disc nots to a pair of spinal nerves t there are 8 cervical spinal cord segments 7C T L S SC segments are named after vertebrae

C spinal nerve exits from a lateral foramen instea of an intervertebral foramen The cervical enlargement innervates thoracic limb co Ct The lumbo sacral enlargement innervates hind limb Ty L Endemmedularis tapered end of the spinal cord contains the last 8 lo spinal cord segments spinal roots extend past Sc termination to line up with intervertebral foramina cauda equina cauda equina is made of con us medullar is spinal nerves and filum terminate pia mater In dogs SC segments are located in the vertebra that is one cranial to the segment's number C Tie The hole in the middle of the spinal cord is called the central canal surrounded by grey matter filled with CSF Grey matter has dorsal lateral and ventral horns SAD DAVE sensory affarent dorsal dorsal affaren ventral efferent White matter regions dorsal lateral ventral funiculi Sensory neurons bring information to the CNS and motor neurons bring information away from the CNS d dorsal root brings info in ventral takes it away 3 main SC arteries A Ventral longest artery in bed

unpaired B Dorsolateral supply white matter there are no lymph nodes in central nervous tissue Venous drainage internal venous plexus communicate with inter arcuate branches