What are the 3 cranial fossa?

The 5 bones that make up the skull base are the ethmoid, sphenoid, occipital, paired frontal, and paired temporal bones. The skull base can be subdivided into 3 regions: the anterior, middle, and posterior cranial fossae.

Where is anterior cranial fossa?

Base of the skull. Upper surface. (Anterior cranial fossa is the top of the three indentations.) The anterior cranial fossa is a depression in the floor of the cranial base which houses the projecting frontal lobes of the brain.

What lies in the posterior cranial fossa?

The posterior cranial fossa is part of the cranial cavity, located between the foramen magnum and tentorium cerebelli. It contains the brainstem and cerebellum. This is the most inferior of the fossae. It houses the cerebellum, medulla and pons.

What is the bone at the base of your skull called?

The term “skull base” refers to the bottom of the skull, or the plate of bone upon which the brain sits. The skull base is an important area since it separates the brain from the remainder of the anatomic structures in the head, including the sinuses, eyes and ears.

What is a fossa in human anatomy?

In anatomy, a fossa (/ˈf?s?/; plural fossae (/ˈf?siː/ or /ˈf?sa?/); from the Latin “fossa”, ditch or trench) is a depression or hollow, usually in a bone, such as the hypophyseal fossa (the depression in the sphenoid bone). Some examples include: In the Skull: Cranial fossa. Anterior cranial fossa.

What is cranial anatomy?

Anatomical terminology. The skull is a bony structure that forms the head in vertebrates. It supports the structures of the face and provides a protective cavity for the brain.

What is the only movable bone of the skull?

The mandible, or jaw bone, is the only movable bone of the skull, forming the temporomandibular joint with the temporal bone. The lower teeth are rooted into the mandible while the upper teeth are rooted in the two maxillae.

Which bones articulate with the sphenoid?

Articulations. The sphenoid articulates with the frontal, parietal, ethmoid, temporal, zygomatic, palatine, vomer, and occipital bones and helps to connect the neurocranium to the facial skeleton.

Which bone forms part of the floor of the cranium?

The cranium is formed of one frontal bone, two parietal bones, one sphenoid, two temporal bones, one occipital bone, and one ethmoid. The frontal bone forms the anterior part of the cranium, including the superior portion of the orbits (eye sockets), the forehead, and the roof of the nasal cavity.

What is the bone located in the Anterosuperior of the skull?

(1 bone)Located on the Anterior, Superior portion of the skull, forms the forehead, some features are the Supraorbital foramina, Frontal sinus, & Coronal suture. (2 bones)Located on the Posterior, Superior portion of the skull on the left & right sides of the Sagittal suture.

What goes through the foramen?

The human skull has numerous holes (foramina) through which cranial nerves, arteries, veins and other structures pass. These foramina vary in size and number with age. nerve of pterygoid canal through its anterior wall.

Which bone forms the cheek?

Side view of the teeth and jaws. (Zygomatic visible in center.) In the human skull, the zygomatic bone (cheekbone or malar bone) is a paired bone which articulates with the maxilla, the temporal bone, the sphenoid bone and the frontal bone.

How many bones are found in the upper arm?

Bones of the arm, wrist and hand: There are 64 bones in the upper extremity. They consist of 10 shoulder and arm, 16 wrist and 38 hand bones. The 10 shoulder and arm bones are the clavicle, scapula, humerus, radius, and ulna on each side.

What is the orbit of the eye?

In anatomy, the orbit is the cavity or socket of the skull in which the eye and its appendages are situated. “Orbit” can refer to the bony socket, or it can also be used to imply the contents.

What suture articulates with the most bones?

The two bones articulate to form the sagittal suture. In the front, the parietal bones form the coronal suture with the frontal bone, and in the rear, the lambdoid suture is formed by the occipital bone.

What goes through the foramen magnum?

It is one of the several oval or circular openings (foramina) in the base of the skull. The spinal cord, an extension of the medulla, passes through the foramen magnum as it exits the cranial cavity. Another landmark is the basion located at the midpoint on the anterior margin of the foramen magnum.

Why is the maxilla considered the keystone of the face?

Explanation: It is the keystone because it anchors all facial bones except the mandible. It consists of two bones (maxillae) fused together at the midline.

What goes through the foramen Lacerum?

Furthermore, one of the terminal branches of the ascending pharyngeal artery (itself a branch of the external carotid artery) passes through the foramen lacerum. The ascending pharyngeal artery is one of three possible “meningeal branches” of this vessel. Some emissary veins pass through the foramen lacerum.

What are the six primary sutures of the skull?


  • Coronal suture – unites the frontal bone with the parietal bones.
  • Sagittal suture – unites the 2 parietal bones in the midline.
  • Lambdoid suture – unites the parietal bones with the occipital bone.
  • Squamosal suture – unites the squamous portion of the temporal bone with the parietal bones.
  • What goes through the Cribriform plate?

    Its sides are smooth, and sometimes bulging from presence of a small air sinus in the interior. On either side of the crista galli, the cribriform plate is narrow and deeply grooved; it supports the olfactory bulb and is perforated by foramina for the passage of the olfactory nerves.

    Which bones make up the zygomatic arch?

    The zygomatic arch, or cheek bone, is formed by the zygomatic process of the temporal bone (a bone extending forward from the side of the skull, over the opening of the ear) and the temporal process of the zygomatic bone (the side of the cheekbone), the two being united by an oblique suture (zygomaticotemporal suture);

    What are the two bones that form the nasal septum?

    The vomer and the perpendicular plate of the ethmoid bone. The vomer contributes to the inferior portion of the nasal septum; the perpendicular plate of the ethmoid bone contributes to the superior portion.

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