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Update: Primary motor cortex

www.utdallas.edu_tres_integ_mot2_2_08.jpgThe primary motor cortex in the posterior frontal lobe (Brodmann area 4) was first described by David Ferrier in 1874, who used electrical stimulation to map the cortical areas responsible for movement in monkeys 1).

Since these initial findings, the description of this area has evolved to include the concept of a somatotopic map, wherein different parts of the body are represented individually on the primary motor cortex, as observed by Penfield and Boldrey 2)

 

1) Ferrier D. Experiments on the brain of monkeys – No. I. Proc R Soc Lond. 1874;23:409–30.
2) Penfield W, Boldrey E. Somatic motor and sensory representations in the cerebral cortex of man as studied by electrical stimulation. Brain. 1937;60:389–443

David Ferrier has died

Sir David Ferrier FRS (13 January 1843 – 19 March 1928) was a pioneering Scottish neurologist and psychologist.

The primary motor cortex in the posterior frontal lobe (Brodmann area 4) was first described by David Ferrier in 1874, who used electrical stimulation to map the cortical areas responsible for movement in monkeys 1).

1) Ferrier D. Experiments on the brain of monkeys – No. I. Proc R Soc Lond. 1874;23:409–30.

Taylor Haughton line

In 1900 Taylor and Haughton described a technique to define a line on the scalp directly above the central fissure 1)

1. Draw a Nasion-Inion line ( Nasion – Just below Glabella and Inion -External Occipital protruberance)

2. Divide the Nasion-Inion line in to 25%, 50% and 75%

3. Bregma is the point between the 25% and 50% points and Lambda is at 75% point

4. Sylvian fissure is drawn from the orbitotemporal angle (A point of depressin where eyebrow ends) to the 75% point on naso-inion line.

5. Draw a line perpendicular to the root of the zygoma starting at preauricular point

6. Central sulcus is drawn from 54% point on naso-inion line to the point where the sylvian line cuts the perpendicular line

1) Taylor EH,Haughton WS.Some recent researchers on the topography of the convolutions andfissures of thebrain.Trans R Acad Med Ireland 1900;18:511-522