Podcast
Questions and Answers
Which action is primarily controlled by the biceps brachii?
Which action is primarily controlled by the biceps brachii?
- Adduction of the wrist joint.
- Pronation of the forearm.
- Extension of the elbow joint.
- Rotation of the forearm outwards and flexing the elbow joint. (correct)
Damage to the Triceps Brachii would most significantly impair which movement?
Damage to the Triceps Brachii would most significantly impair which movement?
- Extending the elbow joint. (correct)
- Flexing the elbow joint.
- Rotating the forearm.
- Abducting the wrist.
Which of the following muscles assists in flexing the elbow, especially when the palm is facing down (pronation)?
Which of the following muscles assists in flexing the elbow, especially when the palm is facing down (pronation)?
- Brachialis (correct)
- Biceps brachii
- Supinator
- Brachioradialis
A person is holding a hammer with their palm neither facing up nor down. Which muscle is primarily assisting in flexing the elbow in this neutral forearm position?
A person is holding a hammer with their palm neither facing up nor down. Which muscle is primarily assisting in flexing the elbow in this neutral forearm position?
If someone is turning a screwdriver to tighten a screw (rotating the palm downward), which muscle is primarily involved?
If someone is turning a screwdriver to tighten a screw (rotating the palm downward), which muscle is primarily involved?
Which muscle works in opposition to the pronator teres to turn the palm upwards?
Which muscle works in opposition to the pronator teres to turn the palm upwards?
Which movement would be MOST affected by damage to the flexor carpi ulnaris?
Which movement would be MOST affected by damage to the flexor carpi ulnaris?
Which muscles are responsible for extending and abducting the wrist joint?
Which muscles are responsible for extending and abducting the wrist joint?
What is the anatomical term for the upper arm?
What is the anatomical term for the upper arm?
Besides arm movements like abduction, flexion and extension, where is the deltoid located?
Besides arm movements like abduction, flexion and extension, where is the deltoid located?
Flashcards
Biceps Brachii
Biceps Brachii
Located on the front of the upper arm with two heads, responsible for flexing the elbow joint and rotating the forearm outwards.
Triceps Brachii
Triceps Brachii
Located on the rear of the upper arm, responsible for straightening the elbow joint.
Brachialis
Brachialis
Located under the biceps brachii, assists in elbow flexion, especially when the palm is pronated.
Brachioradialis
Brachioradialis
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Pronator Teres
Pronator Teres
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Supinator Muscle
Supinator Muscle
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Flexor Carpi Radialis
Flexor Carpi Radialis
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Extensor Carpi Radialis Longus & Brevis
Extensor Carpi Radialis Longus & Brevis
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Flexor Carpi Ulnaris
Flexor Carpi Ulnaris
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Deltoid
Deltoid
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Study Notes
- The arm muscles include the biceps brachii, triceps brachii, brachialis, brachioradialis, pronator teres, supinator, flexor carpi radialis, extensor carpi radialis longus and brevis, flexor carpi ulnaris, and extensor carpi ulnaris.
Biceps Brachii
- Located on the front of the upper arm.
- Has two heads - a long and short one.
- Rotates the forearm outwards.
- Flexes the elbow joint.
Triceps Brachii
- Located on the rear of the upper arm.
- Primarily extends the elbow joint.
Brachialis
- Located underneath the biceps brachii.
- Aids in elbow flexion, especially when the forearm is pronated (palm down).
Brachioradialis
- Located on the lateral side of the forearm.
- Aids in flexing the elbow joint when the forearm is in a neutral posture (neither fully supinated nor fully pronated).
Pronator Teres
- Located on the medial side of the forearm.
- Rotates the palm downward (pronation).
Supinator
- Located on the lateral side of the forearm.
- Opposes the pronator teres, turning the palm upwards (supination).
Flexor Carpi Radialis
- Located on the front side of the forearm.
- Flexes and abducts the wrist joint.
Extensor Carpi Radialis Longus and Brevis
- Located on the back side of the forearm.
- Abduct and extend the wrist joint.
Flexor Carpi Ulnaris
- Located on the medial side of the forearm.
- Flexes and adducts the wrist joint.
Extensor Carpi Ulnaris
- Located on the back of the arm.
- Stretches and adducts the wrist joint.
Major Arm Muscles
- The four major muscles of the arm are the biceps brachii, triceps brachii, brachialis, and brachioradialis.
Biceps and Triceps Functions
- Biceps brachii, on the front of the upper arm, flexes the elbow.
- Triceps brachii, on the back of the upper arm, extends the elbow.
Main Arm Muscles
- The two main muscles in the arm for flexion and extension are the biceps brachii and the triceps brachii.
Terminology
- The upper arm is also called the brachium or simply the arm.
- The lower arm is commonly called the forearm.
- The deltoid is a large, triangular muscle on the shoulder responsible for various arm movements, including abduction, flexion, and extension.
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