What type of joint is present within the thumb?
Hinge.
Condylar.
Saddle.
Ball and Socket.
The Correct Answer is C
The thumb has three joints: the carpometacarpal (CMC) joint, the metacarpophalangeal (MP) joint, and the interphalangeal (IP) joint.
The CMC joint is a saddle type of joint that allows the thumb to move in multiple directions. A saddle joint has two concave surfaces that fit together like a rider on a horse.
Choice A is incorrect because hinge joints allow only flexion and extension movements, such as the IP joints of the thumb.
Choice B is incorrect because condylar joints have an oval-shaped surface that articulates with a shallow cavity, such as the MP joint of the thumb.
Choice D is incorrect because ball and socket joints have a spherical head that fits into a cup-like socket, such as the shoulder or hip joints.
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Related Questions
Correct Answer is D
Explanation
The mastoid process is a bony projection of the temporal bone at the posterior base of the skull.
It allows the attachment of muscles such as the sternocleidomastoid and splenius capitis.
It also contains air-filled spaces called the mastoid air cells.
Choice A is incorrect because the occipital bone forms the back and base of the skull and does not have a mastoid process.
Choice B is incorrect because the sphenoid bone is a butterfly-shaped bone at the base of the skull that does not have a mastoid process.
Choice C is incorrect because the frontal bone forms the forehead and the upper part of the eye sockets and does not have a mastoid process.
Correct Answer is ["Mastoid process"]
Explanation
The mastoid process is a bony prominence located on the temporal bone of the skull, behind the ear.
It serves as an attachment site for several muscles, including the sternocleidomastoid and the splenius capitis.
The mastoid process also contains small air cells that are connected to the middle ear, which play a role in regulating the pressure within the ear.
In addition, the mastoid process is located in close proximity to several important structures, including the facial nerve, the internal jugular vein, and the sigmoid sinus.
Injuries to the mastoid process can occur as a result of trauma, infection, or tumors, and can cause pain, swelling, and other symptoms.
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