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Purpose of Sinuses Not present at birth but develop to strengthen and lighten bone Fontanelle Place where sutures meet and widen that allow the bones of the skull to mold to pass through birth canal Scaphocephaly Premature closure of sagittal suture resulting in a football shaped head Oxycephaly Premature closure of coronal suture resulting in tower shaped head Plaglocephaly Premature closure of ipsilateral coronal or lamboid suture resulting in asymmetrical cranium Cervical cysts Remnants of the 2nd, 3rd and 4th clefts along the edge of the sternocleidomastoid that should be obliterated when the 2nd arch grows over them Teacher Collins Syndrome Underdevelopment of maxillary prominance from arch I Robin Sequence Underdevelopment of mandibular prominance from arch I Thyroglossal Cyst A midline cyst found along the route of descent (extra thyroid tissue) Foramen cecum Place where the thyroid descend from to its final location Thymus comes from which arch 3rd Arch Cranial Nerve(s) associated with arch I CN V Cranial Nerve(s) associated with arch II CN VII Cranial Nerve(s) associated with arch III CN IX Cranial Nerve(s) associated with arch IV & VI CN X Neural Crest Derivatives of the Skull Viscerocranium (cartilaginous ossification) Somite Derivatives of the Skull Neurocranium (membranous ossification)