Final Exam Flashcards
How many cervical nerves/vertebra are there?
8/7
How many thoracic nerves/vertebra are there?
12/12
How many lumbar nerves/vertebra are there?
5/5
How many sacral nerves/vertebra are there?
5/5 (fused together)
How many coccygeal nerves/vertebra are there?
1/4
Define conus medullaris
Term for end of spinal cord
Define Cauda equina
Horse tail-like nerves below cauda equina
Level of the end of the spinal cord
L1 or L2 vertebra
Filum terminale function
Anchors end of spinal cord to proper to the coccyx
Level of the end of the dural sac
S2
Location of lumbar cistern
Between L2 and S1
Why perform spinal taps at the lumbar cistern?
Because the is no more spinal cord within the subarachnoid space.
When does brainstem become spinal cord?
Beyond the foramen magnum.
Type of information carried by the dorsal rami
Sensory and Motor
Type of information carried by the ventral rami
Sensory and Motor
Type of information carried by the dorsal root
Sensory
Type of information carried by the ventral root
Motor
Location of 1st order neuron cell bodies
Dorsal root ganglia
Define efferent
Information leaving
Define afferent
Information arriving
1st order neuron type (cell shape)
Pseudounipolar
Where do the first order neurons of the dorsal column synapse?
Nucleus gracillis/cuneatus
What spinal cord structure contains the cell bodies of the sympathetic nerves?
Lateral horns
What ascending tract carries the sensation of pain?
Lateral spinothalamic tract
Function of impulses transmitted in the tectospinal tract
Allow for movement of the neck to allow eyes to follow a moving object
The CSF in the central canal of the spinal cord is…
hardly circulating
Function of cervical/lumbar enlargements
Supply arms/legs with motor and sensory innervation
Location of cervical enlargement
C4 - T1
Location of lumbar enlargement
L2 - S3
Where do the dorsal rootlets enter the spinal cord?
Posterolateral sulcus
Where do the ventral rootlets emerge from the spinal cord?
Anterolateral sulcus
Fibres in the cuneate fasciculus come from which levels
Above T6 vertebrae
Fibres in the gracile fasciculus come from which levels.
Below T6 vertebrae
Functions of the hippocampus
- Formation and consolidation of declarative memory
- Spatial orientation, navigation, and memory
- Pattern completion/recognition
- Cognitive/behavioural flexibility
- Emotional responses
- Stress responses
Amygdala functions
- Autonomic and endocrine responses to fear
- Fear conditioning and fear memory
- Emotional value of events/facts
- Arousal
- Aggression
- Sexual orientation
- Social interaction
Define ascending reticular activating system
Axons sent from reticular formation to cerebral cortex, thalamus, and hypothalamus.
Ascending reticular activating system function
wakefullness and consciousness
Reticulospinal tract functions
controls posture, and axial and proximal muscles
Components of the central nervous system
Brain and spinal cord
Components of the peripheral nervous system
Ganglia, sensory receptors, nerves, motor endings
Neurotransmitter for somatic muscle contraction
Acetylcholine
Neurotransmitter for autonomic ganglia
Acetylcholine
Neurotransmitter for autonomic innervation
Acetylcholine and norepinephrine
Location of pre-ganglionic parasympathetic cell bodies
CNIII, CNVII, CNIX, CNX, S2, S3, S4
Location of post-ganglionic parasympathetic cell bodies
In ganglia near target organs
Parasympathetic neurotransmitter
Acetylcholine
Oculomotor n. (CNIII ) parasympathetic innervation
Smooth muscle in eye
Facial n. (CNVII) parasympathetic innervation
Lacrimal gland, submandibular and lingual glands
Glossopharyngeal n. (CNIX) parasympathetic innervation
Nasal mucosa and parotid gland
Vagus n. (CNX) parasympathetic innervation
Heart, lungs, liver, gallbladder, stomach, pancreas, large intestine, small intestine
Ganglia innervated by oculomotor n. (CNIII)
ciliary G
Ganglia innervated by facial n. (CNVII)
Pterygopalatine G and Submandibular G
Ganglia innervated by glossopharyngeal n. (CNIX)
Otic G
S2 - S4 parasympathetic innervation
Rectum, urinary bladder, genitalia, uterus
Location of pre-ganglionic sympathetic cell bodies
T1 - L2 lateral horns
Location of post-ganglionic sympathetic cell bodies
sympathetic trunk ganglia, collateral ganglia, adrenal gland
Pre-ganglionic sympathetic neurotransmitters
Acetylcholine
Post-ganglionic sympathetic neurotransmitters
Norepinephrine (and a little acetylcholine)
Sympathetic effector organs that are innervated with acetylcholine
Sweat glands and blood vessels of skeletal muscles
Structures innervated by sympathetic division ONLY
sweat glands, arrector pili muscles, smooth muscle of blood vessels, and adrenal gland
3 features of sympathetic trunk ganglia
Paravertebral, paired, segmented
2 features of collateral ganglia
prevertebral, unpaired
Structure sympathetic signal passes through to get from spinal nerve to sympathetic trunk
white rami communicantes
Structure sympathetic signal passes through to get from sympathetic trunk to spinal nerve
grey rami communicantes
Explanation for referred pain
Visceral sensory signals combined with somatic sensory fibers