Here is your chance to be an anatomy king or queen for a day. We plan on dispersing these anatomic snippets of the brain in small groups so as not to overwhelm you, however, you will find complete descriptions at MRI Online.
You are shown one T1 sagittal image of a 71-year-old male. Focus on the inferior frontal gyrus anteriorly which makes the letter M. Do you see the letter M? It is made up of three components.
Q1 – Can you identify these inferior frontal sulcus structures labeled in pink, blue, and yellow?
Q2 – The staircase descending sulcus labeled with a multitude of orange arrows, behind the pars opercularis, is representative of what sulcus?
Q3 – The purple arrow highlights what sulcus?
Q4 – The unlabeled gyrus in front of the purple arrow represents what?
Q5 – The pars opercularis of the inferior frontal gyrus is known as Brodmann area ___?
Q6 – The pars triangularis of the inferior frontal gyrus surrounds the anterior horizontal limb of the lateral sulcus and is bounded caudally by the anterior ascending limb of the lateral sulcus, white arrow, represents Brodmann area ___?
Q7 – Brodmann areas 44 and 45 are named after what famous French physician?
A1 – The pink arrow highlights the pars orbitalis, blue indicates the pars triangularis, and yellow is the pars opercularis.
A2 – Precentral sulcus.
A3 – Central sulcus of Rolando.
A4 – Precentral gyrus, a critical contributor to motor function.
A5 – Brodmann area 44.
A6 – Brodmann area 45.
A7 – Pierre Paul Broca who lived from 1824 to 1880. This French physician, anatomist and anthropologist is best known for the area named after him, namely Broca’s area. He ascertained that patients suffering from aphasia contained abnormalities in the left frontal region in this locus. Broca’s area abnormalities produce expressive aphasia. Expressive aphasia is characterized by partial loss of the ability to produce language (spoken, manual, or written), although comprehension remains intact. Speech is difficult and full of effort. It usually includes important words of content but omits functional words that only have grammatical significance and not real word meaning such as prepositions. Another name given to this is “telegraphic speech”. The person’s intended message can be understood but is usually grammatically incorrect. In severe forms of expressive aphasia a person may only speak with single-word utterances.
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For more case review, check out MRI Online.