What components contribute to the blood brain barrier?

Looks at the histology of the spinal cord in the picture. What section of the spinal cord is this image from?

Judd was in an accident and suffered brain damage resulting in a coma.  Which part of the damaged brain is keeping him in the coma?

The patellar reflex is a polysnaptic reflex which includes a sensory neuron, interneuron, and motor neuron that sends signals to the brain to process.

The blood brain barrier consists of blood vessels and astrocytes in the gyri of the brain and functions to selectively prevent some molecules from entering the brain, like immune cells.

Ventral horns receive sensory information and process that to send to the brain.

REM sleep occurs at several times in the night during sleeping and is when dreams occur.

Megan was being chased by a dog.  She was running and was very scared.  She could hear the dog barking getting closer and closer to her.  She turned her head and saw the dog right behind her. Which cranial nerve is involved in hearing the dog bark? Which cranial nerve allow her to turn her head? Which cranial nerve allows her to recognize it is a dog chasing her?

An epidural is given only below the L3 vertebrae so that no injury to the spinal cord can occur since it has to penetrate into the cerebrospinal fluid within the arachnoid layer of the meninges.

The patellar reflex is an example of a monosynaptic reflex which involves only 2 neurons, a sensory and a motor neuron.