Chapter 8: Human Muscular System pt2 Flashcards
What are the muscles of the rotator cuff?
- Subscapularis
- Infraspinatus
- Teres minor
- Supraspinatus
What is this muscle?
Subscapularis
What is this muscle?
Infraspinatus
Origin: Infraspinous fossa of scapula
Insertion: Greater tubercle of humerus
Action: Rotates arm laterally
What is this muscle?
Teres minor
Origin: Lateral border of scapula
Insertion: Greater tubercle of humerus
Action: Laterally rotates arm (synergist with infraspinatus)
What is this muscle?
Supraspinatus
Origin: Supraspinous Fossa of scapula
Insertion: Greater tubercle of humerus
Action: Abducts arm
What muscles make up the shoulder?
- Deltoid
- Biceps Brachii
- Long head
- Short head
What is this muscle? (second line down)
Deltoid
Origin: Lateral third of clavicle, Acromion, and subscapular spine
Insertion: Deltoid tuberosity of humerus
Action: Aducts arm
What is this muscle?
Biceps Brachii
- Long head origin : Supraglenoid tubercle
- Short head origin: Coracoid process
Insertion: Radial tuberosity
Action: Flexes and supinates forearm
What muscles make up the upper arm?
- Brachialis
- Biceps brachii
- Triceps brachii
- Long head
- Medial head
- Lateral head
What is this muscle? (bottom label)
Brachialis
Action: Flexes forearm
What is this muscle?
Triceps Brachii
- Lateral head origin: Posterior shaft of humerus
- Long head origin: Infraglenoid tubercle of scapula
- Medial head: Posterior shaft of humerus
Insertion: Olecranon of ulna
Action: Extends forearm
What muscles are involved in the forearm?
- Brachioradialis
- Extensor digitorum
- Extensor carpi ulnaris
- Flexor carpi ulnaris
- Palmaris longus
- Flexor carpi radialis
- Pronator teres
What is this muscle?
Brachioradialis
Action: Synergist in forearm flexion
What is this muscle?
Extensor digitorum
Action: Extends fingers
What is this muscle?
Extensor carpi ulnaris
What is this muscle?
Flexor carpi ulnaris
Action: flexes wrist
What is this muscle?
Palmaris longus
What is this muscle?
Flexor carpi radialis
What is this muscle?
Pronator teres
What muscles(and structure) make up the Anterior hip and thigh muscles?
- Iliopsoas
- Pectineus
- Adductor longus
- Gracilis
- Sartorius
- Tensor fasciae latae
- Iliotibial band
- Quadriceps femoris group
- Rectus femoris
- Vastus lateralis
- Vastus medialis
- Vastus intermedius
What is this muscle?
Iliopsoas
- Iliacus origin: Iliac fossa
- Psoas major origin: Lumbar vertebrae and T12
Insertion: Lesser Trochanter of femur
Action: Thigh flexion
What is this muscle?
Pectineus
What is this muscle?
Adductor longus
What is this muscle?
Gracilis
What is this muscle?
Sartorius
Origin: Anterior superior iliac spine
Insertion: Medial aspect of proximal tibia
What is this muscle?
Tensor fasciae latae
Origin: Anterior aspect of iliac crest and anterior superior iliac spine
Insertion: Iliotibial tract
What is this structure?
Iliotibial tract
What is this muscle?
Quadriceps femoris
- Action: Extends the knee
- Rectus femoris
- Origin: Anterior inferior iliac spine
- Insertion: Patella and tibial tuberosity via patellar ligament
- Vastus lateralis
- Origin: Greater trochanter of femur
- Insertion: Patella and tibial tuberosity via patellar ligament
- Vastus medialis
- Origin: Linea aspera of femur
- Insertion: Patella and tibial tuberosity via patellar ligament
- Vastus intermedius
- Insertion:patella and tibial tuberosity via patellar ligament
What is this muscle?
Rectus Femoris
What is this muscle? (first on left)
Vastus lateralis
What is this muscle? (third down on the right)
Vastus medialis
What is this muscle? (second on the left)
Vastus intermedius
What are the components of the posterior hip and thigh muscles?
- Gluteus medius
- Gluteus maximus
- Adductor magnus
- Hamstring group
- Biceps femoris
- Semitendinosus
- Semimembranosus
What is this muscle?
Gluteus medius
Origin: Ilium
Insertion: Greater trochanter of femur
Action: Abducts the thigh
What is this muscle?
Gluteus maximus
Origin: Ilium, sacrum, coccyx
Insertion: Gluteal tuberosity of femur
Action: Extends the thigh (hip)
What is this muscle?
Adductor magnus
What is this muscle group?
Hamstring group
Origin: Ischial tuberosity
Action: Flexes knee
- Biceps femoris Insertion: Lateral condyle of tibia
- Semitendinosus Insertion: Medial aspect of tibia
- Semimembranosus insertion: Medial condyle of tibia
What is this muscle? (first two points)
Biceps Femoris
Origin: Ischial tuberosity
Insertion: Lateral condyle of tibia
Action: Flexess knee
What is this muscle?
Semitendinosus
Origin: Ischial tuberosity
Insertion: Medial aspect of tibia
Action: Flexes knee
What is this muscle? (last point)
Semimembranosus
Origin: Ischial tuberosity
Insertion: Medial condyle of tibia
Action: Flexes knee
What muscles make up the distal lower limb muscles?
- Gastrocnemius
- Soleus
- Fibularis Longus
- Extensor digitorum longus
- Tibialis anterior
What is this muscle?
Gastrocnemius
- Lateral head origin: Lateral condyle of femur
- Medial head origin: Medial condyle of femur
Insertion: Calcaneus via calcaneal tendon
Action: Plantar flexion
What is this muscle?
Soleus
What is this muscle?
Fibularis longus
What is this muscle?
Extensor digitorum longus
What is this muscle?
Tibialis anterior
Origin: Lateral condyle and tibial shaft
Insertion: Medial cuniform and first metatarsal bone
Action: Dorsiflexion
