Intro to Brainstem I Flashcards
Brainstem has 3 Main Functions
CONDUIT FUNCTIONS
INTEGRATIVE FUNCTIONS
CRANIAL NERVE FUNCTIONS
CONDUIT FUNCTIONS
Transit and processing stations for ascending and descending pathways to and from cerebrum, cerebellum, and spinal cord
INTEGRATIVE FUNCTIONS
“Keeps You Alive!”: Integrative functions, such as consciousness, sleep-wake cycle, muscle tone, posture, respiratory and cardiovascular control
CRANIAL NERVES in Brainstem
Home of the cranial nerves (III-XII)
Midbrain embryo
mesencepholon
Medulla embryo
Myelincephlon
Pons embryo
Metencephlon
Brainstem can also be divided longitudinally into 3 divisions
Tectum or “roof”- sup/inf colliculi
tegmentum
Basis
Brainstem can also be divided into medial and lateral divisions
Corresponds to alar (dorsal/sensory) and basal (ventral/ motor) plates
Sulcus limitans
Separates Alar and Basal
Corticospinal
Motor
Decussates at base of medulla
Dorsal Column – Medial Lemniscus
Fine touch, vibration, proprioception
Decussates mid-medulla
Anterolateral System (spinothalamic)
Pain and temp
Decussates at level of spinal cord
Peduncles
Means “stalk”
Collection of tracts that travel together from one part of the brain to another
There is 1 cerebral peduncle (called “the cerebral peduncle)
There are 3 cerebellar peduncles (called superior, middle and inferior cerebellar peduncle)
There are ____ cerebellar peduncles (called ____________________)
Three
superior, middle and inferior cerebellar peduncle
There is _____ cerebral peduncle (called ___________)
one
“the cerebral peduncle
Bundle of axons in CNS
Tract
Bundle of tracts that connect L and R cerebral hemispheres
Commissure
Bundle of tracts that travel from one region of the CNS to another and look like a “stalk = _______?
Peduncle
Bundle of axons in PNS = _______?
Nerve
Peduncles- Cerebrum
cerebellum–> CP–>
Spinal cord
Pons
CN nuclei
Peduncles-Cerebellum SCP
SCP
—>
Peduncles- Cerebellum MCP
cerbral cortex–> Pons–> MCP–> cerebellum
Peduncles- Cerebellum ICP
ICP
—>
