Five components of PRM
inherent mobility of the brain and spinal cord
the fluctuation of the CSF
the mobility of the intracranial and intraspinal membranes
the articulatory mobility of the cranial bones
the involuntary mobility of the sacrum between the ilia
Contributors to cranial motion
Traube-Hering Wave - due to changes in blood flow velocity
Glial cells
Motion Characteristics fo CRI
Rate - 10-14 Rhythm - regular, like ocean tide Amplitude - SD may diminish Direction - longitudinal and symmetric Strength - SD may diminish
Sutherland Fulcrum
functional name given the straight sinus as the origin of the 3 sickle-shaped agents of the falx cerebri and the tentorium cerebelli
Reciprocal Tension Membrane
the meninges(tentorium, falx cerebri, and cerebellum) and the cord constitute a link between the cranium and the sacrum holds bones of vault and base under constant tension allows but limits motion
Main Poles of Attachment
Anterior/superior pole - crista galli
anterior/inferior pole - clinoid processes of sphenoid
lateral pole - mastoid angles of parietals and petrous ridges of temporal bones
posterior pole - internal occipital protuberance and transverse ridges
Sutures
Coronal Sagittal Parietosquamous Spenosquamous temporozygomatic lambdoidal occipitomastoid *pterion and asterion, bregma and lambda
SBS
Sphenobasilar Symphysis
where the basisphenoid and basiocciput join to form a synchondrosis
SBS Flexion
SBS - moves superiorly
Occipital squama moves - posteriorly and inferiorly
greater wing moves - anteriorly and inferiorly
paired with inhalation
SBS Extension
SBS - moves inferiorly
Occipital squama moves - anteriorly and superiorly
greater wing moves - posteriorly and superiorly
paired with exhalation
CN I
cribriform plate
CN II
Optic canal
CN III
superior orbital fissure
CN IV
superior orbital fissure
CN V
V1 - superior orbital fissure
V2 - foramen rotundum
V3 - foramen ovale
CN VI
superior orbital fissure
CN VII
internal acoustic meatus
facial canal
stylomastoid foramen
CN VIII
internal acoustic meatus
Attachment of dura to sacrum
posterior aspect of S2
respiratory axis
Axis of nutation and counternutation
MT (postural axis)
anterior aspect fo S2
Nutation
nodding of base anteriorly
apex moves posteriorly and superiorly
paired with extension
counternutation
base moves posteriorly
apex moves anteriorly and inferiorly
paired with flexion
