L1: Skull and Cranial Cavity

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47 Questions

Which of the following imaging techniques is commonly used to identify strokes?

CT scan

Which artery is most commonly involved in strokes?

Middle cerebral artery

Which portion of the brain does the middle cerebral artery supply?

Lateral

What happens when there is no anastomoses of cerebral arteries within the brain?

Ischemia occurs

What are the possible deficits caused by a stroke in the area supplied by the middle cerebral artery?

Lateral deficits

What is the function of the cerebellum?

Balance and posture

Which layer of the scalp will contain the majority of the blood vessels supplying the tissues of the scalp?

Dense Connective Tissue

Which bone does not directly suture with the frontal bone?

Mandible

Which sense is the olfactory nerve (CN I) responsible for?

Smell

Which main arteries supply the brain?

Internal carotid and vertebral arteries

What is the name of the arterial circle formed by anastomosis between the internal carotid arteries and the vertebral arteries?

Circle of Willis

Which artery supplies the medial and superior surfaces of the brain and frontal pole?

Anterior cerebral artery

Which artery supplies the lateral surfaces and temporal pole of the brain?

Middle cerebral artery

Which artery supplies the inferior surfaces and occipital pole of the brain?

Posterior cerebral artery

What are the sites of exit and entry to the skull for veins and cranial nerves called?

Foramina

Which portion of the skull is responsible for holding the brain?

Visceral cranium

Which bones make up the facial skeleton?

Nasal bones

Which portion of the skull is responsible for making up the forehead?

Frontal bone

What is the purpose of fontanelles in newborn infants?

To allow for expansion of the skull

Which layer of the scalp contains the upper neurosis of the occipital frontal muscle?

Dense connective tissue

Which layer of the scalp is responsible for the blood supply to the scalp?

Dense connective tissue

What is the function of the upper neurosis in the scalp?

To connect the frontal and occipital muscles

Why is understanding the anatomy of the scalp important in cases of lacerations?

To control bleeding

What is the layer of the meninges that runs down the longitudinal fissure called?

AP Neurosis

Why is it more difficult for a laceration on the scalp to heal compared to a laceration on the arm?

The scalp has a mobile muscle layer underneath

Why does the upper neurotic layer move?

Because of the movement of the muscles on either side

What is the main reason why a skull injury can lead to bleeding?

The skull is difficult to suture properly

Which bone in the skull is thinner at suture points where multiple bones come together?

Frontal bone

What is the condition called when there is a buildup of pressure within the skull due to a blockage in the ventricular system?

Hydrocephalus

Which age group is more likely to have a fontanelle, a cartilaginous structure that allows for expansion and compensation in case of increased intracranial pressure?

Children

What is the risk associated with injuries to the thinner areas of the skull, such as the temple?

Damage to the middle meningeal artery

What are the contents of the Cribriform plate?

CN 1

What are the contents of the Optic Canal?

CN2, Ophthalmic Artery

What are the contents of the superior orbital fissure?

CN 3, 4, 6, 5, (V1)

What are the contents of the Rotundum?

CN5 V2

What are the contents of the Ovale?

CN5 V3, AMMA

What are the contents of the Spinosum?

Middle Meningeal Artery

What are the contents of the lacerum?

*Carotid artery

What are the contents of the Internal Acoustic Meatus?

CN 7 and 8

What are the contents of Jugular Foreamen?

CN 9, 10, 11, and IJV

What are the contents of the Hyoglossal Canal?

CN 12

What are the contents of the Magnum?

Spinal Cord

What is the order of the layers of the SCALP?

Skin, Dense Connective Tissue, Aponeurosis of occipitofrontal muscle, Loose connective tissue, Periosteum of the Skull

What bones make up the neurocranium?

Parietal, Occipital, Temporal, Sphenoid, and Ethmoid

Vertebral arteries enter in which part of the brain to unite and form the basilar artery?

Foramen Magnum

What is the suture point between the frontal, parietal, temporal, and sphenoid bones?

Pterion

What is the term that refers to the build-up of CSF in the skull and presents differently in children and adults?

Hydrocephalus

Study Notes

Skull and Cranial Cavity Module 202 - Lecture 1 Summary

  • Module 202 Anatomy consists of 4 lectures and 4 DR sessions.
  • The lectures cover topics such as the skull, cranial cavity, face, temporal and infratemporal fossa, the orbit and nasal cavity, and the neck and oral cavity.
  • There are additional optional DR sessions for brain removal and face and neck dissection.
  • Students can redeem a free Complete Anatomy Student licence for the module.
  • Slido Q&A is available for students to post anonymous anatomy-related questions.
  • The scalp is composed of skin, connective tissue, aponeurosis, loose connective tissue, and periosteum.
  • Lacerations to the scalp bleed profusely due to the inability of the dense connective tissue layer to retract.
  • The skull is divided into the neurocranium and viscerocranium, which join at sutures.
  • The neurocranium includes bones such as the frontal and ethmoid bones.
  • The viscerocranium includes bones such as the palatine, zygoma, and mandible.
  • The skull contains cranial foramina through which veins, cranial nerves, and arteries enter and exit.
  • The blood supply to the head, neck, and brain is provided by the internal carotid artery, vertebral artery, and the cerebral arterial circle (Circle of Willis).

Test your knowledge of the skull and cranial cavity with this quiz. Learn about the structure and functions of this important part of the human body.

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