What is a shallow longitudinal groove on the posterior surface of a spinal cord structure?
posterior median sulcus. a shallow longitudinal groove on the dorsal surface of the spinal cord.
What are the grooves of the spinal cord?
The spinal cord is elliptical in cross section, being compressed dorsolaterally. Two prominent grooves, or sulci, run along its length. The posterior median sulcus is the groove in the dorsal side, and the anterior median fissure is the groove in the ventral side.
What is the midline groove on anterior surface of the spinal cord?
The anterior median fissure provides a groove in which the anterior spinal artery sits. From here, it provides the anterior part of the spinal cord. It is sourced from the segmental medullary arteries and the segmental spinal arteries which are sourced from the intercostal arteries.
What is the posterior median sulcus?
Medical Definition of posterior median sulcus
: a shallow groove along the midline of the posterior part of the spinal cord that separates the two posterior funiculi and is the external boundary of the posterior median septum.
What happens if the posterior root of a spinal nerve is severed?
D) cell bodies of sensory neurons. E) interneurons. If the posterior root of a spinal nerve is severed, A) output to skeletal muscles would be blocked.
Does spinal reflex involve the brain?
The path taken by the nerve impulses in a reflex is called a reflex arc. In higher animals, most sensory neurons do not pass directly into the brain, but synapse in the spinal cord. … Reflexes do not require involvement of the brain, although in some cases the brain can prevent reflex action.
How many pairs of spinal nerves do humans have?
In total, there are 31 pairs of spinal nerves, grouped regionally by spinal region. More specifically, there are eight cervical nerve pairs (C1-C8), twelve thoracic nerve pairs (T1-T12), five lumbar nerve pairs (L1-L5), and a single coccygeal nerve pair.
Where is lateral horn of spinal cord?
The lateral horn of the spinal cord is the small lateral projection of grey matter located between the dorsal horn and ventral horn and contain the neuronal cell bodies of the sympathetic nervous system.
How can you distinguish between the dorsal and ventral horns?
The dorsal horns are the thinner projections of dark matter that jut out from the rest towards the dorsal/back side of the spinal cord. The ventral horns are the wider projections of dark matter towards the ventral/front side of the spinal cord.
Where is the posterior median sulcus quizlet?
The posterior median sulcus is the posterior end of the posterior median septum of neuroglia of the spinal cord. The septum varies in depth from 4 to 6 mm, but diminishes considerably in the lower part of the spinal cord.
What is the posterior intermediate sulcus?
Posterior intermediate sulcus. – this sulcus divides the posterior funiculus in to the medial gracile fasciculus and the lateral cuneate fasciculus. It is only found in levels rostral to the mid-thoracic spinal cord.