Frontal gyri

The frontal gyri are four gyri of the frontal lobe in the brain. These are four horizontally oriented, parallel convolutions, of the frontal lobe. The other main gyrus of the frontal lobe is the precentral gyrus which is vertically oriented, and runs parallel with the precentral sulcus.

Frontal gyri
Details
Part ofFrontal lobe
PartsInferior, Medial, Middle and Superior
Identifiers
Latingyri frontalis
Anatomical terms of neuroanatomy

The uppermost of the four gyri is the superior frontal gyrus, below this is the middle frontal gyrus, and below this is the inferior frontal gyrus. Continuing from the superior frontal gyrus on the lateral surface, into the uppermost part of the medial surface of the hemisphere is the medial frontal gyrus. The inferior frontal gyrus includes Broca's area.[1] The lowest part of the inferior frontal gyrus rests on the orbital part of the frontal bone.

Gyri
Diagram of gyri of brain viewed on lateral hemisphere. Frontal gyri labelled upper left.

Superior

The superior frontal gyrus makes up about a third of the frontal lobe. It is bounded laterally by the superior frontal sulcus.

Medial

Middle

Inferior

The inferior frontal gyrus includes Broca's area.[2]

gollark: μ is the mean (average, ish) of a random variable. σ, as I said, is standard deviation, which is sort of like the average distance of samples from that random variable from the mean μ.
gollark: Not really.
gollark: I don't think you understood this correctly.
gollark: That is not specific to physics. The numbers are the probability of a random sample lying within that region. The μ and μ+σ and such are saying mean + n standard deviations.
gollark: They're vaguely related, since you can solve lots of linear equations together using matrices.

References
  1. Boisgueheneuc, F. d.; Levy, R.; Volle, E.; Seassau, M.; Duffau, H.; Kinkingnehun, S.; Samson, Y.; Zhang, S.; Dubois, B. (2006-12-01). "Functions of the left superior frontal gyrus in humans: a lesion study". Brain. 129 (12): 3315–3328. doi:10.1093/brain/awl244. ISSN 0006-8950. PMID 16984899.
  2. Grodzinsky, Yosef; Amunts, Katrin (2006-04-20). Broca's Region. Oxford University Press. ISBN 9780198039525.


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