TBL 25: Cranium, Scalp, Face, & Temporal and Infratemporal fossae Flashcards
What bones comprise of the neurocranium?
frontal, parietal, temporal, sphenoid, & occipital
Which bones of the neurocranium are derived from neural crest cells? mesenchymal cells of the paraxial mesoderm?
Neural crest: Frontal, sphenoid, & front half of temporal
Mesenchymal cells from paraxial: back half of temporal, parietal, & occipital bone
What is the calavria? Which bones form this?
Calavria is the skull made up of the frontal, occipital, & parietal bones
Which bones form the base of the neurocranium?
Base of the cranium makes up the floor of the neurocranium and is a combination of frontal, sphenoid, occipital, & temporal bones
What are sutures? fontanelles?
Sutures = narrow seams of connective tissue used to fuse two bones together
Fontanelles = like sutures but at places where 2 or more bones are fused together
What is the viscerocranium? What bones mainly form it?
Viscerocranium is the skeleton of the face and mostly the zygomatic bone, maxilla, & mandible
Describe the formation of the face
The neural crest derived mesenchyme from the 1st pharyngeal arch form the nasofrontal, maxillary, & mandibular prominences
Frontonasal prominences have placodes (ectodermal thickenings) that have invaginations known as nasal pits (future nostrils). These placodes are divided into the medial & lateral nasal prominences. When the maxillary sinuses grow, they fuse medially to form the intermaxillary segment. This fusion also fuses the medial nasal prominences of the two frontonasal. When this happens, the mandibular prominences also fuse together.
Frontonasal prominence =
Maxillary = primary palate, upper lip, & maxilla
Mandibular = lower lip & mandible
What leads to parotidis? Where is the parotid gland found?
Parotid salivary glands are located over the masseter muscle of the mandible
Parotidis can occur when pain occurs w/ resistance to swelling of the parotid gland by a connective tissue sheath surrounding it
