Flashcards in Brain and Cranial Nerves Deck (18):
What does the term "rostral" mean in regards to the brain?
Toward the forehead
What does the term "caudal" mean in regards to the brain?
Toward the spinal cord
What does the term "rostral" mean in regards to the spinal cord/brainstem?
What does the term "caudal" mean in regards to the spinal cord/brainstem?
What are the three major portions of the brain?
Cerebrum, cerebellum, and brainstem
What percent of the brain's volume is the cerebrum, and what does it include?
83%, consists of pair of half globes called cerebral hemispheres marked by thick folds called gyri separated by shallow grooves called sulci
What is the name of the groove separating the two hemispheres of the brain?
What is the think bundle of nerve fibers at the bottom of the longitudinal fissure that connects the hemispheres?
Where is the cerebellum located and what separates it from the cerebrum? What % of volume does it make up?
posterior cranial fossa, inferior to cerebrum, separated by the transverse cerebral fissure, makes up 10% of brain's volume
Which portion of the brain contains the majority of the neurons? What percent are in this portion?
Cerebellum, contains 50% of neurons
What does the brainstem consist of?
All of the brain except the cerebellum and cerebrum
List the major components of the brainstem, from rostral to caudal
diencephalon, midbrain, pons, and medulla oblongata
Where does the brainstem end?
foramen magnum of the skull
What is the seat of the neurosomas, dendrites, and synapses; and forms a surface layer called the cortex over the cerebrum and cerebellum; and deeper masses called nuclei surrounded by white matter?
where is white matter in relation to grey matter in the brain?
deep to the cortical grey matter in most of the brain
what is white matter composed of?
tracts, or bundles of axons, which connect one part of the brain to another and to the spinal cord
What tissue layer of an embryo does the nervous system develop from?