NEURO 3 Flashcards
Brainstem
Connects spinal cord and diencephalon/cerebrum
Reticular system
Within brainstem, general awareness
Connections to diencephalon and spinal cord
Centers for cardio and respiratory
Medulla oblongata
Most inferior
Ventral - pyramid and olivary eminence
Dorsal - cerebellum
IX, X, XI, XII
Pons
Floor of 4th ventricle
Connect to cerebellum
Nerves V, VI, VII, VIII
Midbrain
Merges with diencephalon
Bases contain crus cerebra and substantia nigra
Roof contains tectum
Cerebral aqueduct passes thru
Nerves III, IV
CN1
Olfactory
Sensory
Olfactory mucosa to olfactory bulb to limbic cortex
Above nasal cavity
CN2
Optic
Sensory
Neural retina to thalamus
Crosses at optic chiasm
Behind eyes
CN3
Oculomotor
Motor
Somatic - innervates 5 eye muscles
Parasymphathetic - innervates 2 eye muscles
Under optic nerve
CN4
Trochlear
Motor
Somatic innervates 1 eye muscle
Side of pons
CN5
Trigeminal
Both
Three branches = ophthalmic, mandibular, maxillary
Muscle of mastication
Face and oral cavity sensation
Thick
CN6
Abducens
Motor
Somatic innervates 1 eye muscle
Bottom of pons
CN7
Facial
Both
Facial expression, taste and sensation for anterior 2/3 of tongue
Wet glands EXCEPT parotid
Parasympathetic
Next to trigeminal
CN8
Vestibulocochlear
Sensory
Cochlear branch for hearing, vestibular branch for balance
Under facial
CN9
Glossopharyngeal
Both
Taste and sensation of posterior 1/3 of tongue
Parotid gland
Under vestibular cochlear
Parasympathetic
CN10
Vagus
Both
Chest and abdominal viscera
Parasympathetic
CN11
Accessory
Motor
Innervates SCM and traps
Hangs vertically like a scarf
CN12
Hypoglossal
Motor
Muscles of tongue
Drapes into hole (mouth)
Sensory system
3 neuron chain
Dorsal column/medial leminscus system
Fine touch, proprioception
1. Receptor in skin
2. DRG
3. Fasciculus cuneatus (arm) or fascicles gracious (leg)
4. Interneuron in brainstem, crosses midline
5. Nucleus cuneatus (arm) or nucleus gracilus (leg)
6. Internal arcuate
7. Ascend to VPN of thalamus
8. Internal capsule
9. 1ary sensory cortex
Anterolateral system (ALS)
Gross touch, pain, temp
1. Receptor in skin
2. DRG
3. Interneuron in spinal cord, crosses midline
4. VPN in thalamus
Anterior/posterior spinocerebellar tracts
Proprioception