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What does the trochlea articulate with
The Trochlear notch
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The olecranon fossa is anterior or posterior
Posterior
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Coronoid fossa is anterior or posterior
Anterior
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What are the ridges on the inferior end of the humorus
Lateral supraepicondylar ridge
Medial supraepicondylar ridge
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What is the posterior fascia of the upper arm
Brachial fascia
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What seperates the Anterior fascia from the posterior fascia of the uper arm
- Lateral Intramuscular septum
- &
- Medial Intramuscular septum
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What muscles of the arm are in the Anterior Compartment
- Coracobrachialis
- Biceps brachii
- Brachialis
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Biceps brachii m. action, innervation, and test
- Action:
- Supinate forearm
- Flex forearm (when it is supinated and already flexed ~90o)
- Abduct and weakly flex the arm
- Stabilizes shoulder joint
- Innervation
- Musculocutaneous n. (C5, C6, C7)
- To Test
- Flex the elbow against resistance with forearm supinated
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What is considered the Triarticulate m. and why
The bicepts brachii because it works across three joints. Glenohumeral, Humeroulnar and proximal radioulnal
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What is this
Ruptured Tendon of Long Head, Biceps Brachii m.
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Coracobrachialis m. action and innervation
- Action
- Flex and adduct arm
- Helps resist shoulder dislocation
- Innervation
- Musculocutaneous n. (C5, C6, C7)
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Brachialis m. action and innervation
- Action
- Main flexor of
- the forearm
- Innervation
- Musculocutaneous n. (C5-C6)
- To Test
- Flex the elbow against resistance with forearm semi-supinated
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What nerve goes through the brachialis muscle
Musculocutaneous
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Posterior Compartment Muscles of the Arm are
Tricepts brachii and anconeus
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Tricepts brachii innervation and action
- Action
- Extend forearm (agonist)
- Resist inferior shoulder dislocation (long head)
- Innervation
- Radial n. (C6, C7, C8)
- To Test
- Abduct arm 90o, then the flexed forearm
- is extended against resistance
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Anconeus action and innervation
- Action
- Assist with forearm extension (synergist)
- Stabilize elbow (tenses the joint capsule)
- Innervation
- Radial n. (C7, C8, T1)
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The radial nerve supplies what muscles of the upper arm
Tricepts brachii
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Extensor Muscles are inportant to what group of people
Paraplegics, they use them to move the chair as well as lift their body to get in a chair
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While examining a patient with a lacerated radial nerve at the radial groove, following a mid-shaft humerus fracture, you notice that he can weakly extend a flexed forearm. Which of the following explains your observation?
The radial nerve fibers to the long and lateral heads of the triceps branches off superiorly to the radial groove
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What artery travels over the trochlea
Brachial artery
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Why is the brachial artery great for blood pressure readings
It is pressed against the humerus and trochlea giving it a site of good compression, (should be taken at heart level)
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What is the Cubital Fossa and what does it contain
The cubital fossa is the triangular area on the anterior view of the elbow
- Median cubital v.
- Lateral cutaneous n. of forearm
- Medial cutaneous n. of forearm
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What are the contents of the Deep cubital fossa
- Biceps brachii tendon
- Brachial a. (+ accompanying deep veins)
- Median n.
- (TAN) for Tendon, Artery and Nerve
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What is considered the (Grace of God) tendon
Biceps tendon
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Humeroulnar joint includes
articulation between trochlear notch (ulna) and trochlea (humerus)
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Humeroradial articulation is between
radial head (radius) and capitulum (humerus)
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Proximal Radio-Ulnar Joint has what function
Articulation between the radial head (of radius) and the radial notch (of ulna)
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Radial head is secured in position by the
Anular ligament
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Three components of Elbow joint
- Synovial joints
- Joint capsule
- Collateral ligaments
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The joints of the elbow are
 - Humeral trochlear - Trochlear notch
Humeral capitulum - Concave radius head
Radial head - Radial notch of ulnar
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The Collateral ligaments of the elbow are
- Radial collateral lig
- Ulnar collateral lig
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Ulnar collateral lig. has what three bands
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3rd most common joint dislocation is
 - Dislocation of Elbow
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“nursemaid’s elbow” or “pulled elbow” is what condition
- Subluxation & Dislocation of the Radius
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A physician performs bicipital myotatic reflex to assess the integrity of which spinal nerve roots?
C5-C6
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