5 Questions
What does the term 'upper limb' include in a tetrapod vertebrate?
Structures from the scapulae and clavicles down to and including the digits
In formal usage, how is the term 'arm' defined?
Structures from the shoulder to the elbow, explicitly excluding the forearm
How are the terms 'upper limb' and 'arm' related?
They are not synonymous
What is the informal usage of the term 'upper arm' in anatomy?
It is redundant
How can the muscles of the upper limb be classified in the human body?
By origin, topography, function, or innervation
Study Notes
Upper Limb and Arm in Tetrapod Vertebrates
- In a tetrapod vertebrate, the term "upper limb" includes the scapula, humerus, radius, ulna, carpals, metacarpals, and phalanges.
Definition of Arm
- In formal usage, the term "arm" refers specifically to the segment between the shoulder and elbow, consisting of the humerus bone.
Relationship between Upper Limb and Arm
- The term "arm" is a part of the "upper limb", which includes the entire limb from the shoulder to the fingertips.
Informal Usage of Upper Arm
- In informal anatomy, the term "upper arm" refers to the region between the shoulder and elbow, which includes the humerus bone and surrounding soft tissues.
Classification of Upper Limb Muscles
- In the human body, the muscles of the upper limb can be classified into two groups: extrinsic muscles (originating from the torso and inserting into the upper limb) and intrinsic muscles (originating and inserting within the upper limb).
Test your knowledge of the human upper limbs with this quiz. Explore the skeletal structure, muscles, and functions of the arms, forearms, and hands. Get ready to learn about the intricate details of the shoulder, elbow, wrist, and knuckle joints.
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