Muscles of the Upper Limb Notes

Upper Limb Definition: Refers to the entirety from the shoulder to the fingertips.
Arm: Anatomically refers specifically to the area of the humerus, from shoulder to elbow.
Forearm: The area beyond the elbow, includes the radius and ulna.
Hand: The area beyond the forearm, consisting of the wrist and fingers.
Important Note: Be careful with the term "arm" in anatomy as it only refers to the upper arm.

Location: Anterior side of the arm.
Structure: Composed of two heads (hence "biceps").
Function:
Flexes the Forearm: Primary action during forearm flexion, commonly practiced in weight lifting.
Aids in Arm Flexion: Works synergistically with the pectoralis major when lifting the arm forward.
Supination: Facilitates turning the palm upwards, observable during the action of lifting the palm to the ceiling.
Synergist Muscle:
Brachialis: Located posterior to the biceps brachii, assists primarily in flexion of the forearm.

Location: Medial side of the arm, near the armpit, attaching at the coracoid process.
Function:
Flexion of the Arm: Aids the pectoralis major in flexing the arm.
Adduction of the Arm: Helps pull the arm inward towards the body.

Location: Extends from the humerus to the radius, mainly on the thumb side of the forearm.
Function:
Flexion of the Forearm: Assists in flexing the forearm, particularly useful in actions such as lifting.

Location: Posterior side of the arm; consists of three parts (hence "triceps").
Function:
Antagonist to Biceps Brachii: Opposes the actions of the biceps brachii.
Extension of the Arm: Responsible for extending the arm and the forearm.
Prime Mover for Forearm Extension: Major muscle utilized in forearm extension such as during pushing movements.

Upper Limb: This means everything from your shoulder to your fingertips.
Arm: This part is just the section of your arm that goes from your shoulder to your elbow.
Forearm: This is the section from your elbow to your wrist where your radius and ulna bones are.
Hand: This is everything from your wrist to your fingers.
Important Note: When people say "arm" in medical talk, they only mean the upper arm, not the whole arm to the hand!

Where It Is: It’s on the front of your upper arm.
What It Does:
Flexes the Forearm: It helps bend your arm at the elbow.
Lifts Your Arm: It helps you lift your arm forward, like when you reach for something.
Turns Your Palm Up: It helps when you turn your hands palm-up, like when you show someone your open hand.
Helps Other Muscles: There’s another muscle called Brachialis behind it that helps bend your elbow too.

Where It Is: This muscle is on the inside part of your arm, near your armpit.
What It Does:
Helps Flex Your Arm: It helps the big chest muscle (pectoral muscle) lift your arm.
Brings Your Arm In: It pulls your arm closer to your body.

Where It Is: This muscle goes from your upper arm to your thumb side of your forearm.
What It Does:
Helps Bend Your Forearm: It helps when you bend your arm, like when you lift your elbow up.

Where It Is: It’s on the back of your upper arm and has three parts!
What It Does:
Works Against Biceps: It does the opposite of what the biceps does.
Straightens Your Arm: It helps you push your arm out straight.
Major Helper for Pushing: This muscle is the one you use a lot when you push things away from you.