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Anterior and lateral views of the skull

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Structures seen on the anterior and lateral views of the skull.

The human skull consists of about 22 to 30 single bones which are mostly connected together by ossified joints, so called sutures. The skull is divided into the braincase (cerebral cranium) and the face (visceral cranium).

The main task of the skull is the protection of the most important organ in the human body: the brain. The brain is almost entirely enclosed by the cerebral cranium with the exception of the foramen magnum and other foramina at the skull base which serve as entry and exit point for blood vessels and cranial nerves. In this article we will see the bones of the skull as seen from an anterior and lateral view. 

Key facts about the skull bones
Frontal bone Forms the forehead and part of the orbital socket (orbital surface)
Greater wing of sphenoid bone Foramen rotundum  (CNV/II), foramen ovale (CNV/III), foramen spinosum  (middle meningeal artery), foramen petrosum  ocasionally  (lesser petrosal nerve)
Lesser wing of sphenoid bone Forms the anterior border of the middle cranial fossa
Bony Orbit Orbital surface of frontal bone, orbital surface of the sphenoid bone, orbital process of the palatine bone, orbital surface of zygomatic bone, orbital surface of ethmoid bone
Mandible Condyle, ramus, coronoid process
Maxilla Articulates with nasal bones, alveolar processes, frontal process 
Zygomatic bone Forms part of the lateral orbital rim and the lateral part of the orbital socket
Nasal skeleton Ethmoid bone (cribriform plate, crista galli), frontal bone, nasal bones
Ethmoid bone Orbital part of the ethmoid bone forms the is part of the medial portion of the eye socket
Parietal bone Articulations with the frontal, occipital, and parietal bones
Temporal bone Squamous part, mastoid process, petrous part
Contents
  1. Sphenoid bone
  2. Facial skeleton and sensory nerves
  3. Mandible
  4. Maxilla and zygomatic arches
  5. Nasal skeleton
  6. Parietal bone
  7. Temporal bone
  8. Summary
  9. Sources
+ Show all

Sphenoid bone

The greater wing of the sphenoid is a structure that extends from the side of the body of the bone to curve backwards and laterally. The most posterior part of this projection is a triangular process that fits neatly into the ridge between the petrous and squamous portion of the temporal bone.

The sphenoid bone (lateral view)

The greater wing of the sphenoid contains the foramina for many structures. These include:

Foramina of the middle cranial fossa

The lesser wings of the sphenoid are paired wings that extend from the anterior clinoid process laterally to form the anterior border of the middle cranial fossa.

Lesser wing of the sphenoid bone (anterior view)

The optic canal travels through the medial portion of the wings, and the sella turcica which contains the pituitary gland sits just behind the clinoid processes. Together with the posterior clinoid process (which arise from the body of the pituitary itself) they make a structure that resembles a ‘four poster bed’ in which the pituitary sits. The origin of the words clinoid and clinical are both ‘klinikē’ which is Greek for ‘bedside’.

Facial skeleton and sensory nerves

The orbital surface of Frontal bone is the anteroinferior most section and gives rise to the roof of the orbital socket. The bone articulates with the zygomatic bone laterally the sphenoid bone deep in the eye socket as well as the ethmoid bone at the deep medial section of the eye socket.

The orbital surface of the Zygomatic bone is the lateral rim and border of the orbital socket. The bone articulates medially with the maxilla, superiorly with the orbital process of the frontal bone, and with the sphenoid bone deep in the eye socket.

The infraorbital foramina are paired openings that can be located on the malar surface of the maxillary bone and transmits the infraorbital nerve. This nerve is a branch of the maxillary division (CNV/II) of the trigeminal nerve and provides sensory innervation to the lower eyelid and cheek.

Infraorbital nerve through the infraorbital foramen (anterior view)

The mental foramina are paired openings that are located on the anterior most aspect of the mandible and transmit the mental nerve. This provides sensory innervation to the chin area and is a branch of the mandibular division (CNV/III) of the trigeminal nerve.

Mental nerve (anterior view)

In humans the Glabella is the region found between both eyebrows and refers to both the overlying skin and the underlying bone which is also indented. The bone is the orbital process of the frontal bone in the midline as it articulates with both paired nasal bones. The supraorbital notch transmits the supraorbital nerve which provides sensory innervation to the eyebrow and upper eyelid.

Supraorbital notch (lateral view)

The orbital plate of the ethmoid is a thin plate of bone and forms part of the medial part of the eye socket. It is part of the ethmoid bone which is a small unpaired bone which separates the nasal cavity from the brain.

The Zygomatic bone forms part of the lateral orbital rim as well as the lateral part of the orbital socket. The bone articulates with the maxilla inferiorly, the frontal bone superiorly and the sphenoid bone within the eye socket.

Mandible

Mandible (lateral view)

The mandible is the bone that forms the lower jaw. It consists of various parts including the condyle, which articulates with the temporal bone at the temporomandibular joint, the ramus which forms the posterior border, the body which contains the tooth sockets, and the coronoid process to which the temporalis muscle gains its insertion.

The bone contains the inferior alveolar (a.k.a. mandibular) foramen at the inner surface of the ramus of the mandible which allows the inferior alveolar nerve; a branch of the mandibular nerve which is a branch of the trigeminal nerve. It allows the nerve to enter the bone and innervate the lower teeth. The body of the mandible can be described as the main bulk of its structure. It is the horizontal section of the bone which gives rise to the row of inferior teeth. The orbital surface of maxilla is the superior aspect of the bone which gives rise to the medial part of the floor of the orbital socket.

The ramus of the Mandible is a ridge of bone that connects the body of the bone to the condyle. The condyle articulates at the TMJ or Temporomandibular joint. The joint is complex and allows for not only pivot movement for opening and closing, but also some anterior translation. Ligament control the range of the movement in this joint.

Maxilla and zygomatic arches

Maxilla (anterior view)

The maxilla is the bone that forms the upper jaw. The zygomatic process articulates with the zygomatic bone laterally, the frontal process articulates with the nasal bones in the anterior midline, the alveolar process gives attachment to the superior teeth and the palatine process which forms the anterior two-thirds of the hard palate.

The Alveolar process is a thickened ridge of bone that contains the teeth sockets that give rise to the teeth which attach by immovable joints known as gomphosis.

Alveolar process of the maxilla (anterior view)

The frontal process of maxilla is the portion of the bone that ascends lateral to the nasal bones. Along with the lacrimal bone and the ethmoid bone, the bone articulates with the orbital surface of the frontal bone superiorly. The frontal process of Zygomatic is the part of the bone that articulates with the frontal bone. The bone extends superiorly and forms the lateral part of the eye socket

Nasal skeleton

Ethmoid bone (anterior view)

The Ethmoid bone is a small unpaired bone that separates the brain from the nasopharynx. The cribriform plate of the ethmoid bone transmits the fibres of the olfactory nerve. The crista galli is an upward facing ridge of bone that divides the two halves of the plate.

The Frontal bone overlies the frontal lobe of the brain anteriorly and forms the forehead and part of the orbital socket. The bone articulates with the parietal cones posteriorly and the greater wing of the sphenoid bone laterally.

Nasal bone (anterior view)

The Nasal bones are two small paired structures that form the bony part of the external nose. They articulate with anteroinferior portion of the frontal bone superiorly and the nasal process of the maxillary bone laterally. This is in addition to the opposing nasal bone and the ethmoid bone within the orbit. The bones give attachment to the quadrangular cartilage of the nasal septum and the lateral cartilages that form the lateral part of the nasal bridge.

Test your knowledge on the anterior view of the skull with this quiz.

Parietal bone

The Parietal bone articulates with the frontal bone anteriorly and overlies the parietal lobe of the brain. It articulates with the occipital bone posteriorly as well as the temporal bone laterally.

Parietal lobe (lateral view)

Temporal bone

The Temporal bone is a complex structure with numerous sections. These include the squamous portion which is similar in structure to other bones of the skull and forms the anterosuperior part of the bone. The outer surface of this portion is convex to allow for the attachment of the temporalis muscle. The mastoid is a significant pyramidal protrusion from the underside of the bone and gives rise to the sternocleidomastoid and splenius capitis and the longissimus capitis.

The petrous portion of the bone is a hard pyramidal shaped section of the bone that has a complex structure but essentially contains the organs of hearing. The name ‘petrous’ comes from the latin word ‘petrosus’ which means ‘stone-like’, the tympanic section of the bone surrounds the external auditory meatus and the styloid process.

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