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Human Anatomy > Unit 3_The Skull, Inner Ear & Mandible > Flashcards

Unit 3_The Skull, Inner Ear & Mandible Flashcards

1
Q

How many bones are attached to each other by sutures?

A

22

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2
Q

True or false, bones are attached to each other by sutures in infants?

A

False - bones attach to each other by sutures with growth

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3
Q

How many bones are included in the Neurocranium compartment?

A

8

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4
Q

How many bones are included in the Viscerocranium (facial skeleton)?

A

14

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5
Q

What bony compartment of the skull includes the brain and neurological components?

A

Neurocranium

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6
Q

What bony compartment of the skull includes expression, eating, speech, breathing, etc?

A

Viscerocranium

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7
Q

What are the bones of the skull?

A
  1. 2 Parietal Bones
  2. Sphenoid Bone
  3. 2 Temporal Bones
  4. Maxilla
  5. 2 Lacrimal Bones
  6. 2 Nasal Bones
  7. Frontal Bone
  8. Ethmoid Bone
  9. 2 Zygomatic Bones
  10. Occipital Bone
  11. Mandible
  12. Palatine Bone
  13. Vomer
  14. Sutural Bone (Wormian)
  15. 2 Inferior Nasal Conchae
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8
Q

What bones of the skull don’t have sutures?

A
  1. Frontal Bone
  2. Maxilla
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9
Q

What separates the 2 Parietal bones?

A

Sagittal Suture

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10
Q

What is protection for the brain?

A

The Skull

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11
Q

What separates the cranial bones?

A

Fibrous Sutures form Fibrous Joints

Sutures become ossified with age (Synostosis)

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12
Q

What are three fibrous skull sutures that form fibrous joints?

A

Coronal Suture

Sagittal Suture (Ss)

Lambdoid Suture (LS)

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13
Q

What are non-named bones that are unique to an individual?

A

Sutural Bone (Wormian) (Wb)

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14
Q

What are large unossified gaps between bones filled with fibrous tissue that close in the first year of birth?

A

Fontanelles

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15
Q

What portion of the skull is bigger in newborns and levels out with age?

A

Neurocranium

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16
Q

What drains de oxygenated blood, the neurocranium and the scalp into the dural venous sinuses?

A

Diploic Veins

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17
Q

What are the orbit-pyramidal shaped socket contributing bones?

A

Boundaries:

  • Roof - Frontal Bone
  • Medial Wall - Lacrimal, Ethmoid bone (Orbital Plate)
  • Lateral Wall - Zygomatic Bone
  • Floor (Inferior) - Maxilla
  • Apex - Greater wing-sphenoid

Openings:

  • Optic Canal
  • Superior Orbital Fissure
  • Inferior Orbital Fissure
  • Infraorbital Groove
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18
Q

What is the meeting place for the frontal, parietal, temporal, and sphenoid bones? It’s also a weak (vulnerable) spot due to “skull thinness”?

A

The Pterion

19
Q

What artery is behind the Pterion?

A

The Middle Meningeal Artery and its branches lie in the epidural space:

  • The anterior branch of the Middle Meningeal Artery (deep to the Pterion)
  • The posterior branch of the Middle Meningeal Artery
20
Q

What can form in the space between the Dura mater and the bones of the skull where the middle meningeal artery is positioned?

A

Hematoma; often fatal - 15-20%

21
Q

What structures of the brain are included in the anterior cranial fossa of the cranial cavity/vault?

A
  1. Frontal lobes of the cerebral cortex
  2. Lesser wing of Sphenoid bone
  3. Orbital plates of Frontal bone
  4. Cribriform plates of Ethmoid bone & Crista Galli
22
Q

What structures of the brain are included in the middle cranial fossa of the cranial cavity/vault?

A
  1. Temporal lobes of the cerebral cortex
  2. Greater wing of sphenoid bone
  3. Parietal bone & squamous part-temporal bone
  4. Petrous part-temporal bone
23
Q

What structures of the brain are included in the posterior cranial fossa of the cranial cavity/vault?

A
  1. Cerebellum and Brainstem
  2. Occipital bone
  3. Petrous part of the temporal bone
  4. Parietal bone
24
Q

What bone of the skull forms the Orbital Plates, covers the Orbits, forms the Forehead, and contains the Frontal Lobes-Cerebral Cortex?

A

Frontal Bone

25
Q

What bone of the skull forms the Posterior Portion & Floor, contains Foramen Magnum, and contains the Brainstem and Cerebellum?

A

Occipital Bone

26
Q

What articulates with the articular facets of C1 (the Atlas) to form the atlanto-occipital joint?

A

The occipital condyles

27
Q

What is a big floor and a holding place for the posterior side of the brain, the brainstem, and cerebellum?

A

Foramen magnum

28
Q

What bone of the skull contributes to form the mid-floor and features greater wings and lesser wings?

A

Sphenoid Bone

29
Q

What bone houses the most important part of our equilibrium and hearing?

A

Temporal Bone

30
Q

What part of the Temporal Bone houses the inner ear (Labyrinth) and CN VIII which passes through the internal acoustic meatus?

A

Petrous Part

31
Q

What holds the Internal Carotid artery?

A

Carotid Canal

32
Q

What holds the CN VII (facial nerve)?

A

Stylomastoid Foramen

33
Q

What parts make up the Temporal Bone in the cranial cavity?

A
  1. Squamous part
  2. Zygomatic part
  3. Petrous part
  4. External acoustic meatus
  5. Styloid process
  6. Mastoid process
34
Q

The inner ear houses sensory receptors that are responsible for detecting what?

A

Equilibrium/vestibular sense

Audition/hearing (cochlea)

35
Q

What senses changes in head position, includes 3 semicircular canals filled with fluid-angular head movements, and vestibule-static head positioning?

A

Equilibrium/vestibular sense

36
Q

What bones vibrate every time you hear a sound?

A

Tympanic Membrane

37
Q

What is the smallest bone in the body?

A

Stapes

38
Q

What does the inner ear house that is responsible for detecting audition?

A

Sensory receptors; audition hearing (cochlea)

39
Q

What helps us recognize when we’re moving up and down (i.e., going up and down in an elevator)?

A

Saccule

Utricle

40
Q

What nerves in the inner ear form vestibulocochlear nerve (CN VIII)?

A

Vestibular nerve

Cochlear nerve

41
Q

What bones make up the mandible?

A

Condylar process

Ramus

Angle

Mental foramen

Body

42
Q

What bones make up the internal surface of the mandible?

A

Coronoid process

Lingula

Mandibular notch

Mandibular foramen (inferior alveolar foramen)

43
Q

What articulates with the skull at the Temporomandibular Joint (TMJ), forms the lower jaw, and is a gliding hinge joint?

A

Mandible

44
Q

What does the inferior alveolar nerve change into once it leaves the inferior alveolar foramen (Mandibular foramen) through the mandible and exits the mental foramen?

A

Mental Nerve

Human Anatomy (31 decks)

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