NR 603 Week 1 Questions with 100%
Correct Answers | Latest Update 2024 |
Rated A+
differentiate between the lateral and medial motor systems - ✔✔lateral =
distal //fine motor
- lateral corticospinal tract
- rubrospinal tract
medial = proximal //gross motor
- anterior corticospinal tract
- reticulospinal tract
- tectospinal tract
- vestibulospinal tract
,discuss the lateral corticospinal tract in terms of axons - ✔✔90% axons cross
in pyramidal decussation (medulla)
discuss the anterior //medial corticospinal tract in terms of axons - ✔✔8%
axons cross in spinal cord + 2% axons from lateral corticospinal tract that do
NOT cross in pyramidal decussation (medulla)
innervates everything, but ONLY tract that innervates fine motor movements e.g.
hands
discuss the reticulospinal tract - ✔✔medial motor system
brainstem = automatic responses e.g. postural control
discuss the tectospinal tract - ✔✔medial motor system
, turning eyes/head to orient peripheral
discuss the vestibulospinal tract - ✔✔medial motor system
balance/postural control reactions
define somatotopy - ✔✔point-for-point correspondence of an area of the body
to a specific point on the CNS e.g. motor/sensory cortex homunculus
where does the rubrospinal tract originate? - ✔✔red nucleus in midbrain
where does the rubrospinal tract decussate? - ✔✔ventral tegmental in midbrain
where does the tectospinal tract originate? - ✔✔superior colliculus in midbrain
Correct Answers | Latest Update 2024 |
Rated A+
differentiate between the lateral and medial motor systems - ✔✔lateral =
distal //fine motor
- lateral corticospinal tract
- rubrospinal tract
medial = proximal //gross motor
- anterior corticospinal tract
- reticulospinal tract
- tectospinal tract
- vestibulospinal tract
,discuss the lateral corticospinal tract in terms of axons - ✔✔90% axons cross
in pyramidal decussation (medulla)
discuss the anterior //medial corticospinal tract in terms of axons - ✔✔8%
axons cross in spinal cord + 2% axons from lateral corticospinal tract that do
NOT cross in pyramidal decussation (medulla)
innervates everything, but ONLY tract that innervates fine motor movements e.g.
hands
discuss the reticulospinal tract - ✔✔medial motor system
brainstem = automatic responses e.g. postural control
discuss the tectospinal tract - ✔✔medial motor system
, turning eyes/head to orient peripheral
discuss the vestibulospinal tract - ✔✔medial motor system
balance/postural control reactions
define somatotopy - ✔✔point-for-point correspondence of an area of the body
to a specific point on the CNS e.g. motor/sensory cortex homunculus
where does the rubrospinal tract originate? - ✔✔red nucleus in midbrain
where does the rubrospinal tract decussate? - ✔✔ventral tegmental in midbrain
where does the tectospinal tract originate? - ✔✔superior colliculus in midbrain
