Anatomy Bones and Muscles · MU Pleven

8. External surface of the cranial base

Covers the underside of the skull, running from the upper incisors to the foramen magnum and divided into anterior palatal, middle sphenoidal-temporal and posterior occipital parts. For each region it lists the contributing bones, then the openings and processes, with the nerves and vessels passing through foramina such as the greater and lesser palatine, foramen ovale, foramen spinosum, carotid canal, jugular foramen and hypoglossal canals. It also notes the occipital condyles, the styloid process and the nuchal lines.

Inside: 7 sections · 5 labelled pictures · 13 flashcards · 2 min

Topic 8 of 236 in the MU Pleven syllabus for Anatomy Bones and Muscles (Medicine, Year 2). The free AceMed note covers it in 5 sections, about 230 words (2 min of reading), with 13 flashcards.

In this note

  1. EXTERNAL SURFACE OF THE CRANIAL BASE
  2. ANTERIOR PART (HARD PALATE REGION)
  3. FEATURES
  4. MIDDLE PART (SPHENOID + TEMPORAL BONE REGION)
  5. POSTERIOR PART (OCCIPITAL REGION)

EXTERNAL SURFACE OF THE CRANIAL BASE

GENERAL : THE EXTERNAL (INFERIOR) SURFACE OF THE CRANIAL BASE IS THE UNDERSIDE OF THE SKULL , SEEN WHEN VIEWED FROM BELOW

IT EXTENDS FROM UPPER TEETH (INCISORS) → FORAMEN MAGNUM

DIVIDED INTO 3 PARTS

  1. 1. ANTERIOR PART (PALATAL REGION)
  2. 2. MIDDLE PART (SPHENOIDAL + TEMPORAL REGION)
  3. 3. POSTERIOR PART (OCCIPITAL REGION)

ANTERIOR PART (HARD PALATE REGION)

BONES → PALATINE PROCESSES OF MAXILLAE

→ HORIZONTAL PLATES OF PALATINE BONES.

FEATURES

INCISIVE FOSSA + INCISIVE CANAL → NASOPALATINE NERVES, SPHENOPALATINE VESSELS

GREATER PALATINE FORAMINA → (POSTEROLATERAL) → GREATER PALATINE VESSELS NERVES

LESSER PALATINE FORAMINA → LESSER PALATINE NERVES, VESSELS

MIDDLE PART (SPHENOID + TEMPORAL BONE REGION)

BONES → SPHENOID, TEMPORAL, VOMER

FEATURES

POSTERIOR NASAL APERTURES (CHOANAE) SEPARATED BY VOMER

PTERYGOID PROCESS OF SPHENOID : MEDIAL + LATERAL PTERYGOID PLATES

FORAMEN LACERUM : CLOSED BY CARTILAGE ; INTERNAL CAROTID PASSES ABOVE

FORAMEN OVALE : MANDIBULAR NERVE (V3)

FORAMEN SPINOSUM : MIDDLE MENINGEAL ARTERY.

CAROTID CANAL OPENINGS : INTERNAL CAROTID ARTERY

STYLOID PROCESS : (MUSCLE / LIGAMENT ATTACHMENT).

EXTERNAL ACOUSTIC MEATUS (EAR CANAL).

MANDIBULAR FOSSA → ARTICULATES WITH MANDIBLE (FORMS TMJ)

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