Speech centers

2. 1.1.WERNICKE’S AREA (22)WERNICKE’S AREA (22)
-Area for language comprehension.-Area for language comprehension.

Posterior 3Posterior 3
rdrd
of superior temporal gyrus,a of superior temporal gyrus,a
surrounding rim of inferior parietel & mid surrounding rim of inferior parietel & mid
temporal cortex.temporal cortex.
FUNCTION :FUNCTION :Transform sensory input into neural Transform sensory input into neural
wordword representation.representation.
Establish distributed assoc that give Establish distributed assoc that give
word its meaning.word its meaning.

3. 2.BROCA’S AREA (44)2.BROCA’S AREA (44)

Anterior pole of language network.Anterior pole of language network.

Posterior part of inferior frontal gyrus $ a Posterior part of inferior frontal gyrus $ a
surrounding rim of prefrontal heteromodal surrounding rim of prefrontal heteromodal
cortex.cortex.

FUNCTION: Transform neural word FUNCTION: Transform neural word
representation into articulatory sequencerepresentation into articulatory sequence
sequencing function-ordering sequencing function-ordering
of words into sentencesof words into sentences

5. 3.ANGULAR GYRI3.ANGULAR GYRI

Lower part of anterior parietal lobeLower part of anterior parietal lobe

FUNCTION : feeds visual information FUNCTION : feeds visual information
conveyed by words from a book into conveyed by words from a book into
wernickes-meaning out of visually wernickes-meaning out of visually
percieved words.percieved words.

6. 4.ARCUATE FASCICULUS4.ARCUATE FASCICULUS

Information passes from wernickes to Information passes from wernickes to
brocas.brocas.
5.PRIMARY MOTOR 5.PRIMARY MOTOR
CORTEXCORTEX

Signals from brocas received to ctrl Signals from brocas received to ctrl
speech muscles.speech muscles.

7. 6.PRIMARY AUDITORY AREA6.PRIMARY AUDITORY AREA

In superior temporal gyrusIn superior temporal gyrus

Reception of sound signalsReception of sound signals
7.PRIMARY VISUAL AREA7.PRIMARY VISUAL AREA

In occipetal lobeIn occipetal lobe

Initial receptive area for words from visual fieldInitial receptive area for words from visual field

8. HEARING N SPEAKINGHEARING N SPEAKING
SOUND SIGNALSSOUND SIGNALS

PRIMARY AUD AREAPRIMARY AUD AREA

WERNICKES AREAWERNICKES AREA
arcuate fasciculusarcuate fasciculus
BROCAS AREABROCAS AREA
CRANILA N NUCLEI(PONS MEDULLA)CRANILA N NUCLEI(PONS MEDULLA)
ANT HORN CELLS IN SP CORDANT HORN CELLS IN SP CORD
facial n cranil n 9 10 12facial n cranil n 9 10 12
SPEECH MUSCLESSPEECH MUSCLES

9. READING N SPEAKINGREADING N SPEAKING
PRIMARY VISUAL AREAPRIMARY VISUAL AREA

ANGULAR GYRUSANGULAR GYRUS

WERNICKESWERNICKES

10. 
Hemispherical dominance-lt hemisphere in Hemispherical dominance-lt hemisphere in
majoritymajority
few-rt hemisphere n in some no few-rt hemisphere n in some no
dominancedominance