Pt 620 TMJ
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| What bony features are anterior to the TMJ? | 1. Mandibular Fossa 2. Articular Tubercle
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| What is the shape of the condyle of the mandible? | football-shaped, long axis medial to lateral
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| What are the two characteristics of the fibrous capsule? | 1. Lax 2. lateral thickening
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| The lateral thickening of the fibrous capsule is called the ... | lateral ligament
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| Are there 1 or 2 synovial cavities in the TMJ? | 2
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| What separates the 2 synovial cavities? | articular capsule
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| What is the upper cavity located between? | disc and skull
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| What is the lower cavity located between? | disc and condylar process
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| The articular disc is made up of what? | 1. fibrocartilage 2. dense fibroconnective tissue
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| What is its strongest attachment (anteriorly)? | capsule and mandible
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| Is the posterior attachment strong or loose? | loose
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| What is the widest point on the disc? | anterior and posterior (middle is thinnest)
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| The disc moves with the _______ of the mandible. | head
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| The movement of the TMJ is a combination of ________ and _________. | rotation and gliding
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| Intially there is ________ of the condyle against the ________. | rotation, disc
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| Secondly there is ______ of the disc ________. | glide, forward
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| The initial rotation of the condyle is what joint cavity? | lower
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| The glide of the disc is movement in what joint cavity? | upper
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| What occurs when the rotation and glide do not work in proper order? Why? | abnormal movement, resulting from laxity of soft tissues
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| In dysfunction the _________ may move _________ to the disc. | head, anterior
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| With abduction to the left the _______condyle slides forward an the _______ rotates around a vertical axis. | right, left
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| What are the muscles of mastication? | 1. Masseter 2. Temporalis 3. Lateral Pterygoid 4. Medial Pterygoid
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| What muscle runs from the zygomatic arch to the ramus of the mandible? | Masseter
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| What muscle runs from the temporal foassa to the coronoide process of the mandible? | Temporalis
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| What muscle runs from the lateral pterygoid plate (lateral surf.) to the neck of mandible, TMJ capsule, and articular disc? | Lateral Pterygoid
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| What muscle runs form the medial surface of the lateral pterygoid plate to the inner surface of the ramus of the mandible? | Medial Pterygoid
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| The masseter muscles are all innervated by? | CN V (v3)
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| What muscle opens the jaw? | lateral pterygoid
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| What muscles close the jaw? | temporalis, masseter, medial pterygoid
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| Protraction is done by what two muscles? | 1. lateral pterygoid (mostly) 2. masseter
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| What retracts the jaw? | 1. posterior fibers of temporalis 2. deep fibers of masseter
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| Side to side is done by... (to left) | left: temporalis posterior fibers (masseter deep fibers) right: lateral pterygoid
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| side to side is done by...(to right) | right: temporalis posterior fibers (masseter deep fibers) left: lateral pterygoid
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| What are the to nerves that provide cutaneous innervation to the scapula and deltoid region? | supraclavicular and upper lateral cutaneous nerve of the arm
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| The supraclavicular nerve is a branch of what? | cervical plexus, C3.4
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| The upper lateral cutaneous nerve of the arm is a branch of what nerve? | axillary
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| What nerve is affected when there is sensory loss over the deltoid? | upper lateral cutaneous nerve of the arm
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| Dermatome of lateral arm | C5
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| dermatome of the lateral forearm to index finger | C6
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| dermatome of middle finger | C7
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| dermatome of medial hand and digits 4 and 5 | C8
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| dermatome of medial forearm into arm | T1
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| dermatome of medial arm into axilla | T2
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| What muscle goes from the lower margin of the spine of the scapula, acromio, and lower margin of lateral 1/3 of scapula to deltoid tuberosity of humerus? | deltoid m.
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| What is the action of the anterior fibers of the deltoid? | flexion and adduction
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| What is the action of the posterior fibers of the deltoid? | extension and adduction
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| The middle fibers of the deltoid _______ the arm. | abduct
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| The deltoid helps the joint capsule in what way? | stabilizes the joint
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| The deltoid m. is innervated by... | axillary n.
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| The muscle that runs from the costal surface of the scapula to the lesser tubercles of the humerus. | subscapularis
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| subscapularis does what action? | medial rotation and stabilizes the joint
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| What nerve innervates subscapuris? | upper and lower subscapular nn.
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| The muscle that runs from the supraspinatus fossa to the lesser tubercle of the humerus (superior facet) | supraspinatus
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| What are the actions of the supraspinatus m. | 1. abduct 2. stabilize joint 2. depress head during abduction.
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| Why must the head of the humerus be depressed during abduction? | It would hit the acromion process.
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| The muscle that foes from the infraspinatus fossa to the greater tubercle of the humerus | Infraspinatus
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| Infraspinatus _________ rotates the arm and _________ the joint. | laterally, stabilizes
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| Infraspinatus is innervated by what nerve? | suprascapular n.
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| The muscle that runs from the lateral border of the scapula (above teres major) and goes to the greater tubercle (lower facet) | teres minor
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| Teres minor mirrors the actions of infrapinatus which are? | lateral rotation and stabilization of the joint
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| The muscle that goes from the lower lateral border of the scapula( as far as inferior angle) to the medial lip of bicipital groove | teres major
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| Teres minor is innervated by... | axillary n.
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| The action of teres major is.. | 1. medial rotation 2. adduction 3. extension
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| Teres major is innervated by... | lower subscapular n.
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| The muscle has digitations from ribs 1-8 and goes to the vertebral border of the scapula on the costal surface and inferior angle of the scapula | serratus anterior
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| what is the action of serratus anterior? | protraction and rotates gelnoid upward
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| Serratus Ant. is innervated by? | long thoracic n.
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| If serratus anterior is deinnervated what happens to the scapula? | It wings out, because the serratus ant. can no longer hold it against the thoracic wall
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| The serratus anterior is important in what rhythm? | scapulohumeral
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| The C5 myotome is tested by what actions? | shoulder abduction and extension
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| What is the scapulohumeral rhythm? | 2:1 ratio of humeral to scapular movement
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| What muscles make up the rotator cuff? (SITS) | 1, supraspinous 2. infraspinous 3. teres minor 4. subscapularis
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| What do the tendons of the rotator cuff blend with? | joint capsule
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| The rotator cuff muscles act collectively to ________ the humerus while the deltoid ________ the arm. | depress, elevates
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| The collection of the tendons of the rotator cuff muscles add _____ to the joint. | stability
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| The suprascapular nerve comes from what trunk of the brachial plexus. | upper
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| When it branches it travels through what "hole"? | suprascapular notch
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| After it passes through the suprascapular notch it goes to what muscle? | supraspinatus
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| It passes between what other notch before heading to infraspinatus muscle? | spinoglenoid notch
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| Then it runs with what artery superior to a _________ | supraascapular a., ligament
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| What cord does the axillary nerve come off of? | posterior
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| It runs backards through the _________ space, and supplies what two muscles? | quadrangular, teres minor and deltoid
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| What cord does both the upper and lower subscapular nerves come off of? | posterior
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| The upper subscapular n. goes directly to what muscle? | subscapularis
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| The lower subscapular n. goes to what two muscles? | teres major and subscapularis
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| Borders of the quadrangular space: 1.Superior 2.Inferior 3.Medial 4.Lateral | 1. Teres Minot 2. Teres major 3. Surgical Neck of Humerus 4. Long head of triceps
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| What are the contents of the quadrangular space? | 1. Posterior humeral circumflex artery 2. axillary n.
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| Borders of the Triangular Space: 1. Superior 2. Inferior 3. lateral | 1. Teres Minor 2.Teres Major 3. lateral head of triceps
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| What are the contents of the triangular space? | Scapular circumflex a.
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| Borders of the Triangular interval: 1. Superior 2. Medial 3. Lateral | 1. Teres Major 2. Long head of the triceps 3. Lateral head of the triceps
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| Contents of the triangular interval | 1. radial n. 2. profunda brachii artery
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| What branches from the subclavian artery supplies the scapular? | transverse circumflex and suprscapular
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| What artery comes from the subscapular branch of the axillary artery? | scapular circumflex
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| What two branches from from the axillary artery directly? | Posterior humeral circumflex and thoracromial trunk
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| What does the posterior humeral circumflex artery supply? | acromion and neck of humerus
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| The thoracoacromial trunk sends branches to the _________ | acromion
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