Lecture 6.4: Skeletal System

AKA: The Cranium Protects our brain Gives us our senses

The Skull

Forehead Orbits—spaces for eyes Frontal sinuses—air-filled chambers Lighten bone Produce mucus for nasal cavity

Frontal Bone

Figure 6.10

Posterior to frontal bone Sagittal suture—locks 2 bones together Coronal suture--locks parietal to frontal

Parietal Bone (Paired)

Figure 6.15b

Most posterior Lambdoid Suture—locks occipital with

parietal Foramen magnum—where spinal cord

passes

Occipital Bone

Figure 6.10

Below parietal Squamous suture—connects parietal to

temporal

Temporal Bone (Paired)

Figure 6.10

Part of floor of cranium Unites cranium and facial bones Sella turcica—depression that houses

pituitary gland

Sphenoid Bone

Figure 6.12a

Anterior to sphenoid Medial eyes and roof and sides of nasal

cavity Nasal septum—divides nose into left/right

sides

Ethmoid Bone

Figure 6.12a