Article Figures & Data
Figures
- Fig 1.
VR image of the left hemisphere of a healthy volunteer. The left image and the right image are the same. The IPL locates posterior to the postCG and is the inferior component of the parietal lobe. The postCS and the IPS form the border of the IPL. The postCS connects with the anterior end of the IPS (black arrowhead) and does not connect with the posterior ascending ramus of the Sy (white arrowhead) in this case. The asterisk indicates the sulcus intermedius primus.
- Fig 2.
Patterns of the IPL. A, Typical pattern. There are no additional gyri. B, PreSMG pattern. The additional gyri (gray tissue) intercalated between the postCS and the SMG. C, PreAG. The additional gyri (gray tissue) positioned between the SMG and the AG.
- Fig 3.
The IPL on VR images and with specimens. A and D, Typical pattern. B and E, PreSMG pattern. C and F, PreAG pattern. A through C indicate VR images; D through F, specimens. The additional gyri are colored.
- Fig 4.
Schematic (left), VR images (middle), and specimens (right) of patterns of the preSMG plus preAG pattern and the SMG plus AG pattern. A-C, PreSMG plus preAG pattern. The additional gyri (gray tissue) positioned both anterior and posterior to the SMG. D-F, SMG plus AG pattern. There is no clear boundary between the SMG and the AG.
Tables
- Table 1:
Sulcal continuity of the inferior parietal lobule in 40 healthy brains studied with VR images and in 50 specimens studied anatomically (Ono et al.8)
Right Hemisphere (%) Left Hemisphere (%) VR Ono et al.8 (specimens) VR Ono et al.8 (specimens) postCS Continuous 47.5 44 40 48 Discontinuous (2 segments) 42.5 40 57.5 48 Discontinuous (≥3 segments) 10 16 2.5 4 IPS Continuous 65 28 70 72 Discontinuous (2 segments) 32.5 68 25 28 Discontinuous (≥3 segments) 2.5 4 5 0 Note:—postCS indicates postcentral sulcus; VR, volume rendering; IPS, intraparietal sulcus.
- Table 2:
Sulcal connections of the inferior parietal lobule in 40 healthy brains studied with VR images and in 50 specimens studied anatomically (Ono et al8)
postCS Connected with Right Hemisphere (%) Left Hemisphere (%) VR Ono et al8(specimens) VR Ono et al8(specimens) IPS 72.5 64 75 72 Sy 52.5 68 30 48 Note:—IPS indicates the anterior end of the intraparietal sulcus; Sy, Sylvian fissure (the posterior ascending ramus of the Sylvian fissure).
- Table 3:
Frequency of gyral patterns of inferior parietal lobule in 40 healthy brains studied with VR images, in 20 specimens studied anatomically, and in 50 specimens studied anatomically by Naidich et al10
Right Hemisphere (%) Left Hemisphere (%) VR Specimens Naidich et al10 (specimens) VR Specimens Naidich et al10 (specimens) Typical 42.5 45 48 35 20 28 preSMG 2.5 5 4 17.5 35 16 preAG 17.5 20 16 0 5 28 Others 37.5 30 32* 47.5 45 28* (preSMG + preAG) (0) (15) − (2.5) (0) − (SMG + AG) (12.5) (10) − (37.5) (40) − (Pattern not identifiable) (25) (5) − (7.5) (5) − Note:—preSMG indicates additional gyri intercalated between the postcentral sulcus (postCS) and the supramarginal gyrus (SMG); preAG, additional gyri positioned between the SMG and the angular gyrus (AG).
* Others were described as pattern not identifiable in the report by Naidich et al10.
