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Lecture 3

SCTM-2002 Lecture Notes - Lecture 3: Pubic Symphysis, Tibia, Synchondrosis

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Stephen Tulk

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Wandy Cheng
Winter 2017
Human Form and Function: Introduction to Anatomy
Lecture 3
- The skull consists of cranial bones
- The shape of the human brain
- The actual texture of the human brain is like oatmeal
- The Skull
o The face is tucked under the cranial
o The face is usually suspended outwards
- Cranial bones encase the brain
o The skull starts as separate bones
o We take advantage of our evolutionary bones
o The critical movement of human existence
Getting the baby’s head out of the womb
The shape of the fetal head is remodelled because the bones can slide
and mould over on themselves to allow combinations
- Frontal BONES
o Forms the forehead and roofs of the orbits
o Contains frontal sinuses
o The significance of the frontal bones in human is that they are very high
o There’s a little bit of difference because men have slightly more prominent
brow than womens
- Posterior view
o The occipital bone form the back and the bottom of the skull
o It also wraps under
There’s a couple of things
Chevron shape where the bones fuse
The big hole is magnum which means big hole
Part of the occipital bone
The skull rocks around on it
- Temporal Bones
o That’s where you tell the passage of time
o Lie inferior to parietal bones
o Form the infero lateral portion of the skull
o Its on your temple
o Specific regions of temporal bone
Squamous (squish, flat part of the temporal bone) and zygomatic
(cheekbones, zygomatic arch, most of us have very dark zygomatic
arch to contour on)
Tympanic (the drum part, ear drums, the ear holes), petrous and
mastoid (distinguish points to the ear and the jaw, convergence of
line) regions
Breast part of the temporal bone
Convergence of the jaw the ear and the mastoid
Take a moment to place an ear in space cause you see it, then place
the mastoid there
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Wandy Cheng
Winter 2017
Human Form and Function: Introduction to Anatomy
o The temporal bones do different things
- Evolutionary point of view
o They didn’t probably hear sounds, they head vibrations
o Modified ancient jaw bones
- Sutures of the Cranium
o Means that theyre sewn together
o Feel the soft spot, you feel the pulsing of the brain
o Frontenel, membrane, it has to sutures itself together to form into a proper
o The planes of the skull
- The Sphenoid bone
o Spans the width of the cranial floor
o Resembles a butterfly or a bat
o Consists of a body and three pairs of processes
o Contains all kinds of really important things like the optic nerves and blood
- The Ethmoid Bone
o The f point bone
o Empty air passage down, instead of going up, what happens? You get a blow
hole! It’s been reworked
o Lies between nasal and sphenoid bones
- Mandible
o What articulates with the skull
o We can bite through nuts because the muscle of the jaw is so massive
o Compares to other vetebraes don’t have opposable thumbs, so they have to
work with their jaws
o The jump of the skull
- Stefan Dion ????
- The caricature works because the artist is able to push his face around
- Othe bones of the face
o Zygomatic bones, a tripod, defining important shapes of the face, enormous
feature to defining this particular feature
o Facial bones
Recaptures air that breaths oue
People start thinking about dinosaurs being warm blooded, because
they have to maintain their body temperature
Because theyre usually known as cold blodded creature
o Special Parts of the Skull
The orbits are the eye socket
Paranasal sinuses occur in frontal, ethmoid, sphenoid and maxillary
bones, extension of the nasal cavity, serve to lighten the skull
Hyoid bone, a moveable base of the tongue
The bony platform of the tongue is what keeps it moving
o Orbits
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