NeuroAnatomy - Lecture Three Objectives Flashcards
Where is the Primary Motor Cortex located?
frontal lobe
precentral gyrus
What is the blood supply to the Primary Motor Cortex?
lateral region - superior branch of MCA
medial region - ACA
What is the primary function of the Primary Motor Cortex?
activates/controls voluntary fine motor movement of contralateral side of the body
What is the function of the Primary Motor Cortex in the lateral region?
activates/controls voluntary fine motor movement of contralateral side of the head/face, neck, and upper extremities
What is the function of the Primary Motor Cortex in the medial region?
activates/controls voluntary fine motor movement of contralateral side of the lower extremities and the trunk
What Brodmann’s Area number is the Primary Motor Cortex?
Brodmann’s Area 4
What are the symptoms of a lesion in the Primary Motor Cortex if it occurs in the ACA?
contralateral hemiplegia/paresis of the lower extremities
What are the symptoms of a lesion in the Primary Motor Cortex if it occurs in the superior MCA?
contralateral hemiplegia/paresis of the lower face and upper extremities
Where is the premotor cortex located?
frontal lobe
What is the blood supply to the Premotor Cortex?
superior branch of MCA
What is the primary function of the Premotor Cortex?
plans voluntary fine motor movements and sends motor plans to the primary motor area for activation
- planning is based on integrating current sensory information
What Brodmann’s Area number is associated with the Premotor Cortex?
Brodmann’s Area 6
What are the clinical characteristics of a lesion in the premotor cortex?
Apraxia due to inability to generate and send the plan to the motor cortex
Where is the Supplementary Motor Area located?
Frontal lobe
What is the primary function of the Supplementary Motor Area?
plans (visualization) complex sequences of voluntary fine motor movements
Micturition - bladder control
What Brodmann’s Area number is associated with the Supplementary Motor Area?
Brodmann’s Area 6
What are the symptoms of a lesion in the Supplementary Motor Area?
Incontinence
Where is the Frontal Eye Field located?
Frontal lobe immediately anterior to PMC/SMA
What is the blood supply of the Frontal Eye Field?
superior branch of MCA
What is the primary function of the Frontal Eye Field?
Horizontal conjugate gaze/eye movements to opposite direction
What Brodmann’s Area number is associated with the Frontal Eye Field?
Brodmann’s Area 8
What are the symptoms of a lesion in the Frontal Eye Field?
horizontal gaze palsy
eyes deviate to the same side of lesion
Where is Brodmann Area 44/45 located?
Frontal lobe along inferior frontal gyrus
What is the blood supply to Brodmann Area 44/45?
superior branch of MCA
What is the primary function of Brodmann Area 44/45 in the DOMINANT hemisphere?
motor production of linguistic components of communication
“specialized” premotor area of speech
What is the primary function of Brodmann Area 44/45 in the NON-DOMINANT hemisphere?
motor production on non-linguistic components of communication
- production of emotional aspect of language
What are the symptoms of a lesion in Brodmann Area 44/45 in the DOMINANT hemisphere?
Broca’s aphasia
- can comprehend language, but cannot speak
What are the symptoms of a lesion in Brodmann Area 44/45 in the NON-DOMINANT hemisphere?
motor dysprosodia
