Speech centers

1.1. WERNICKE’S AREA (22)WERNICKE’S AREA (22)

-Area for language comprehension.-Area for language comprehension.

Posterior 3Posterior 3rdrd of superior temporal gyrus,a of superior temporal gyrus,a surrounding rim of inferior parietel & surrounding rim of inferior parietel & mid temporal cortex.mid temporal cortex.

FUNCTION :FUNCTION :Transform sensory input into neural Transform sensory input into neural wordword representation.representation.

Establish distributed assoc that Establish distributed assoc that give word its meaning.give word its meaning.

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 Posterior part of inferior frontal gyrus

$ a surrounding rim of prefrontal $ a surrounding rim of prefrontal heteromodal cortex.heteromodal cortex.

FUNCTION: Transform neural word FUNCTION: Transform neural word representation into articulatory representation into articulatory sequencesequence

sequencing function-sequencing function-ordering of words into sentencesordering of words into sentences

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.

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.

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 Initial receptive area for words from visual

fieldfield

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 facial n cranil n 9 10

1212 SPEECH MUSCLESSPEECH MUSCLES

READING N SPEAKINGREADING N SPEAKING

PRIMARY VISUAL AREAPRIMARY VISUAL AREA

ANGULAR GYRUSANGULAR GYRUS

WERNICKESWERNICKES

Hemispherical dominance-lt Hemispherical dominance-lt hemisphere in majorityhemisphere in majorityfew-rt hemisphere n in some no few-rt hemisphere n in some no dominancedominance