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Anatomy of the Skull Base and Infratemporal Fossa
Published in John C Watkinson, Raymond W Clarke, Christopher P Aldren, Doris-Eva Bamiou, Raymond W Clarke, Richard M Irving, Haytham Kubba, Shakeel R Saeed, Paediatrics, The Ear, Skull Base, 2018
Posterior to the foramen magnum and hence the basiocciput, the squamous part of occipital bone continues up to fuse along the lambdoid suture with the parietal bones superiorly and mastoid regions of the temporal bones laterally. Externally, a midline crest, the external occipital crest, extends from the foramen magnum up to a projection of bone around 6cm below the lambda, the external occipital protuberance. This crest separates the two sides of the occipital area. Either side of the external occipital protuberance, a concentric ridge of bone extends around to the mastoid process - the superior nuchal line - providing the surface landmark for the attachment of the tentorium cerebelli the transverse sinus (Figure 98.1). Sternocleidomastoid attaches to the lateral half of this line, trapezius to the medial half.
Management of Cervical Spinal Fractures in Ankylosing Spondylitis
Published in Barend J. van Royen, Ben A. C. Dijkmans, Ankylosing Spondylitis Diagnosis and Management, 2006
David M. Hasan, Traynelis Vincent C.
On the lateral sides of the foramen magnum, the oval and convex occipital condyles articulate with the superior facets of the atlas. The condyloid fossae located dorsal to the occipital condyles receive the posterior portions of the superior articular processes of the atlas when the head is extended. The external occipital crest, a ridge which extends from the opisthion to the inion, serves as the attachment site for the ligamentum nuchae.
Influence of Visual Dependence on Inter-Segmental Coordination during Upright Stance in Cerebral Palsy
Published in Journal of Motor Behavior, 2020
Yawen Yu, Carole A. Tucker, Richard T. Lauer, Emily A. Keshner
Three-dimensional kinematic data were collected at 60âHz using a Hawk System (Motion Analysis Inc., Santa Rosa, CA). In order to understand how the body segments were coordinated in responding to the perturbation from the supporting surface and visual field in the sagittal plane, reflective markers were placed on anatomical landmarks. Sagittal orientation was computed for the: head (defined as the vector between the forehead and external occipital crest); thorax (vector between manubrium and C7); hip (vector between L4/L5 joint and midpoint of bilateral ASIS); ankle (midpoint of bilateral head of first metatarsal bone and the midpoint of bilateral malleolus).