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The Skull Here are the bones and regions you will need to know for lab...

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Presentation on theme: "The Skull Here are the bones and regions you will need to know for lab..."— Presentation transcript:

1 The Skull Here are the bones and regions you will need to know for lab...

2 Major Skull Regions 1. The Cranium recognize it from the following views: anterior/posterior lateral inferior interior views cranial vault cranial floor 2. Facial Bones

3 Cranium Cranial Floor: l Anterior cranial fossa l Middle cranial fossa l Posterior cranial fossa Cranial Vault: the superior aspect of the cranium (its ceiling) 6 bones make up the cranium

4 There are 6 cranial bones l frontal l parietal l occipital l temporal l sphenoid l ethmoid These three are easy! This is harder This is the hardest This is easy, but has many parts

5 Occipital Bone l Has the foramen magnum through it l has the occipital condyles on it (to interact with the first vertebra to shake our heads “yes”)

6 Temporal Bone Three main regions: 1. squamous 2. mastoid 3. petrous Other prominent features: styloid process mastoid process zygomatic process external auditory meatus mandibular fossae carotid canal & jugular foramen

7 Sphenoid Bone (general) l visible on a lateral view (between the frontal & temporal bones) l visible on an inferior view l visible on the cranial floor l visible within the bony orbit (positioned posterior & laterally)

8 Sphenoid Bone (specific regions) l looks like a bat greater wing lesser wing l has the sella turcica visible on cranial floor holds the pituitary gland l has the optic canal through it

9 Ethmoid Bone (general) l Not visible externally l Only present medially within the cranium l forms the posterior margins of the nose l visible on the cranial floor l visible medially in the bony orbit

10 Ethmoid Bone (specific regions) l cribiform plate has pores for olfactory nerve to traverse l crista galli ascends into cranial cavity l perpendicular plate descends to meet the vomer l superior & middle nasal conchae are parts of the ethmoid bone

11 Facial Bones l Most, but not all, are visible from the exterior l Give shape to the face l Some are involved in the bony orbit

12 Maxillae & Mandible Maxillae l upper jaw, lip, and medial face l paired & fused l contribute to bony orbit l form most of bony upper palate (the palatine process) Mandible l only movable skull bone l lower jaw l has the mandibular condyle and the coronoid process l contains mental foramen

13 Other obvious facial bones l Zygomatic bone-- the cheek bone (has a temporal process) l Nasal bone-- at the superior border of the nose

14 Less obvious facial bones l Palatine bone-- forms the posterior edge of the bony upper palate & the inferior nasal concha l Vomer bone-- runs vertically, dividing the nasal cavity in two l Lacrimal bone-- medial aspect of bony orbit, tear duct passes through this

15 Bony Orbit 6 bones contribute: l frontal bone l zygomatic bone l sphenoid bone l maxillary bone l lacrimal bone l ethmoid bone

16 Additional items to locate l superior orbital fissure l inferior orbital fissure l supraorbital foramen l infraorbital foramen

17 For this coming Monday lab... l Make sure you review the skull & learn these items l Review bone tissue itself (earlier exercise) l Review the thoracic rib cage l Get ready to work on the appendicular skeleton

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