L:4 Forearm and Elbow Flashcards
Elbow Joint Articulations
(1) the trochlear notch of the ulna with the trochlea of the humerus and
(2) the head of the radius with the capitulum of the humerus.
Radius
– identify medial + lateral aspects and how it articulates with ulna.
-head of radius, neck of radius, articular circumference, radial tuberosity, ulnar notch, styloid process, articular surface.
Ulna
examine this bone and know how to orient yourself according to major landmarks.
- olecranon, trochlear notch, radial notch, coronoid process, ulnar tuberosity, head of ulna, articular circumference
styloid process.
Elbow Joints:
Humeroulnar
Superior Radioulnar
Humeroradial
Superficial layer
Flexors of the Forearm
4
Flexor Carpi Radialis (M),
Pronator Teres, (M)
Palmaris Longus (M)
Flexor Carpi Ulnaris (U)
Intermediate layer
Flexors of the Forearm
1
Flexor Digitorum Superficialis (M)
Deep layer
Flexors of the Forearm
3
Flexor Pollicis Longus, (M)
Pronator Quadratus (M),
Flexor Digitorum Profundus (U + M)
Superficial layer
Extensors of the Forearm
6
Extensor Carpi Radialis Longus (R),
Extensor Carpi Radialis Brevis (R),
Extensor Carpi Ulnaris (R),
Extensor Digitorum (R),
Extensor Digiti Minimi (R),
Brachioradialis. (R)
Deep Layer
Extensors of the Forearm
5
Supinator, (R)
Extensor Indicis (R),
Abductor Pollicis Longus (R),
Extensor Pollicis Longus (R)
Extensor Pollicis Brevis (R),
Describe the points of articulation among the proximal ends of the ulna and radius and the distal end of the
humerus.
description
Where do most of the muscles of the forearm attach? Discuss this for both the flexor and extensor groups.
Flexors: Medial Epicondyle of Humerus
Extensors: Lateral Epicondyle of Humerus
For each movement, name the agonist and antagonist muscle(s)
Elbow Flexion
- Agonist (Prime Mover): Biceps brachii
- Synergists: Brachialis, brachioradialis
- Antagonists: Triceps brachii
For each movement, name the agonist and antagonist muscle(s)
Elbow Extension
- Agonist (Prime Mover): Triceps brachii
- Synergists: Anconeus
- Antagonist: Biceps brachii
For each movement, name the agonist and antagonist muscle(s)
Pronation
-
Agonist (Prime Mover): Pronator teres, pronator quadratus
- Synergist: None specified (these muscles primarily act as pronators)
- Antagonist: Supinator (antagonistic action, as it opposes pronation)
For each movement, name the agonist and antagonist muscle(s)
Supination
-
Agonist (Prime Mover): Biceps brachii (short head), supinator
- Synergist: Brachialis
- Antagonist: Pronator teres, pronator quadratus
Supinator
O: Lateral epicondyle of humerus
I: Lateral, posterior, and anterior surfaces of radius
F: Supinates
N: Radial Nerve
Which Forearm Flexors do NOT originate on the medial epicondyle of the Humerus?
Flexor Pollicis Longus
Flexor Digitorum Profundus
Brachialis
Which Muscle Attaches to the Pisiform?
Flexor Carpi Ulnaris
What Muscle Originates from the Trapezium? What Muscle Attaches to the Trapezium? What do they do?
Nerve Supply?
Originates
Flexor Pollicis Brevis
Flexes the thumb at the Metacarpophalangeal Joint.
Median Nerve
Attaches
Abductor Pollicis Longus
Abducts and extends the thumb at the carpometacarpal joint.
Radial Nerve
Which Muscles are Responsible for Radial Deviation?
Extensor Carpi Radialis Longus,
Extensor Carpi Radialis Brevis,
Flexor Carpi Radialis,
Which Muscles are Responsible for Ulnar Deviation?
Flexor Carpi Ulnaris
Extensor Carpi Ulnaris
What Muscles Originate from the Lateral Epicondyle of the Humerus?
five
Extensor Carpi Radialis Brevis
Extensor Carpi Radialis Longus
Extensor Carpi Ulnaris
Extensor Digiti Minimi
Extensor Digitorum
What Muscle Opposes the Thumb?
Opponens Pollicis (M)
opposes the thumb, allowing it to move toward and touch the other fingers, aiding in fine motor movements and precision grip.
What Muscle Abducts the Thumb?
Abductor Pollicis Brevis (M)
abducting the thumb, moving it away from the palm.
What Muscle Originates from the Hook of Hamate?
Opponens Digiti Minimi (U)
opposes the little finger (digitus minimus), allowing it to touch the thumb and aiding in fine motor movements.
Which Flexor has Two Innervations?
Flexor Digitorum Profundus
Innervated by the median nerve (lateral) and the ulnar nerve (medial)
Which Thumb Muscles are NOT supplied by the radial nerve?
Opponens Pollicis (M)
Abductor Pollicis Brevis (M)
