What do we usually do in the seminar room?

Functional Neuroanatomy of the Motor System from Planning to Execution

Dr. Zobayer Mahmud KhanResident, MS (Anatomy), Block-4

Guided byDr Nahid Farhana AminAssociate ProfessorDept of Anatomy, BSMMU

Objectives

• Mention the gross components related to

somatic motor function

• Explain the mechanism of planning to

execution of somatic motor function

• Correlate the basic pathology of motor

movement with the normal one

Areas of the brain

46

8

9

10

11

12

4445

22

39

40

3 1 2 5 7

6

Areas

43 1 27 5

9

10

11

12

Motor homunculus

Our concept of motor function

video (penalty)

Basic concept of motor activity

Basal nuclei

Cerebellum

Thalamus

Structure of Basal nuclei

Structure of Basal nuclei

• Video (Basal nuclei)

Planning

Basic dysfunction of striatal region of the circuitry

• Hypokinesia & hypertonia

• Hyperkinesia & hypotonia

• Video (magic)

Structure of the cerebellum

Structure

Cerebellar homunculus

Planning

Planning

Execution

Basic dysfunctions

• Timing- Irregular contraction

• Strength- Weak movement

• Direction- Abnormal gait

• Duration- Movement for prolonged period

• Smoothness- Decomposition of the movement

• Coordination- Inability to do alternative

movements

Thalamus

Execution

Execution

Execution

Execution

UMN and LMN lesion

Flaccidity

and

spasticity

• Movie song video

Speech production circuitry

Lesions related to the disorders of motor speech area

• Motor aphasia

• Conduction aphasia

Conjoint (saccadic) movementof the eye

Saccadic disorders

• Abnormal speed of eye movements

(generally slow)

Summery

Thank You

Lesions related to the disorders of motor speech area

• Motor aphasia ( the patient can not speak

properly although he knows what he

intends to communicate

• Conduction aphasia association fibers

connecting the broca’s and wernick’s area

are destroyed. Speech is fluent,

comprehension is intact but the repetition

of spoken language is extremely difficult