Anatomy OINA Flashcards
Abductor Pollicis Brevis innervation and action:
Innervation: Median Nerve Action: Thumb abduction
Flexor Pollicis Brevis Superficial head innervation and action:
Innervation: median nerve Action: Thumb MCP Flexion
Flexor Pollicis Brevis Deep head innervation and action:
Innervation: Ulnar Action: Thumb MCP Flexion
Opponens Pollicis innervation and action:
Innervation: median nerve Action: Oppose thumb
Adductor Pollicis innervation and action:
Innervation: ulnar nerve Action: Thumb adduction and thumb MCP flexion
Palmaris Brevis innervation and action:
Innervation: Ulnar Action: Wrinkles skin
Abductor digiti minimi innervation and action:
Innervation:Ulnar nerve Action: Small finger abduction
Flexor digiti minimi brevis innervation and action:
Innervation: Ulnar nerve Action: small finger MCP flexion
Opponens digiti minimi innervation and action:
Innervation: ulnar nerve Action: oppose small finger
Lumbricals 1&2 innervation and action:
Innervation: median nerve Action: Extend PIP, Flex MCP
Lumbricals 3&4 innervation and action:
Innervation: Ulnar nerve Action: Extend PIP, Flex MCP
Dorsal interosseous innervation and action:
Innervation: ulnar nerve Action: digit abduction and MCP flexion
Palmar interosseous innervation and action:
Innervation: ulnar nerve Action: digit adduction
Anconeus OINA:
O: Lateral epicondyle I: Posterior Proximal Ulna N: Radial A: Forearm extension
Extensor Digitorum Communis OINA:
O: Lateral Epicondyle I: MCP: sagittal band, P2: central slip, P3: Terminal insertion N: Radial- PIN A: Digit extension
Extensor Digiti Minimi OINA:
O: Lateral epicondyle I: Small finger MCP N: Radial- PIN A: Small finger extension
Extensor Carpi Ulnaris OINA:
O: Lateral Epicondyle I: Base of 5th MC N: Radial- PIN A: hand extension and ulnar deviation
Extensor Radialis Brevis OINA:
O: Lateral Epicondyle I: Base of 3rd MC N: Radial- PIN A: Wrist Extension
Brachioradialis OINA:
O: Lateral Condyle I: Distal radius N: Radial A: Forearm flexion
Extensor Carpi Radialis Longus OINA:
O: Lateral Condyle I: Base of 2nd MC N: Radial A Wrist extension
Supinator OINA:
O: Posterior Medial Ulna I: Proximal Lateral Radius N: Radial- PIN A: Supinates forearm
Abductor Pollicis Longus OINA:
O: Posterior Radius and Ulna I: Base of 1st thumb metacarpal N: Radial- PIN A: Abducts and extends thumb
Extensor Pollicis Brevis OINA:
O: Posterior Radius I: Base of thumb proximal phalanx N: Radial- PIN A: Extends the thumb at MCP
Extensor Pollicis Longus OINA:
O: Posterior Ulna I: Base of thumb distal Phalanx N: Radial- PIN A: Extends the Thumb at IP
Extensor Indicis Proprius OINA:
O: Posterior Ulna I: MCP, PIP, DIP or index finger N: Radial- PIN A: extends index finger
Pronator Teres OINA:
O: Medial Epicondyle I: Lateral radius N: Median A: Pronates and flex forearm
Flexor Carpi Radialis OINA:
O: Medial Epicondyle I: Base of 2nd and 3rd metacarpal N: Median A: Flex wrist and radial deviation
Palmaris Longus OINA:
O: Medial Epicondyle I: Flexor retinaculum/ Palmar aponeurosis N: Median A: Flex wrist
Flexor Carpi Ulnaris OINA:
O: Medial Epicondyle I: Pisiform, Hook of Hamate, 5th MC N: Ulnar A: Flex wrist and ulnar deviation
Flexor Digitorum Superficialis OINA:
O: Medial Epicondyle I: Middle Phalanges of digits N: Median A: Flex PIP joint and wrist
Flexor Digitorum Profundus OINA:
O: Anterior Ulna and interosseous membrane I: Distal phalanx of IF, MF, RF, SF N: Median- AIN (IF 1/2 MF) Ulnar (1/2 MF, RF, SF) A: Flex DIP and Wrist
Flexor Pollicis Longus OINA:
O: Anterior radius and proximal ulna I: Distal phalanx of thumb N: Median- AIN A: Flex thumb IP
Pronator Quadratus OINA:
O: Medial distal ulna I: Anterior distal radius N: Median- AIN A: Pronate forearm
Triceps OINA:
O: Long Head: Infraglenoid tubercle Lateral head: Proximal Posterior Humerus Medial Head: Distal Posterior Humerus I: Olecranon N Radial A: Elbow extensor
Brachialis OINA:
O: Distal Anterior Humerus I: Ulnar Tuberosity N: Medial: Musculocutaneous Lateral: Radial A: Flex Forearm
Biceps Brachii OINA:
O: Long head: Supraglenoid tubercle Short head: Coracoid Process I: Radial Tuberosity N: Musculocutaneous A: Flex and supinate forearm
Coracobrachialis OINA:
O: Coracoid process I: middle humerus N: Musculocutaneous A: Flex and adduct arm
Deltoid OINA:
O: Clavicle, Acromion, Spine of scapula I: Deltoid tuberosity N: Axillary A: Abducts arm
Pectoralis Major OINA:
O: Clavicle and Sternum I: Intertubercular Groove N: Lateral Pectoral and Medial Pectoral A: Internal Rotator and Adducts arm
Pectoralis Minor OINA:
O: Ribs 3-5 I: Coracoid process N: Medial pectoral A: Stabilizes scapula
Serratus anterior OINA:
O: Lateral ribs 1-8 I: Medial border of scapula N: Long thoracic A: Upward rotation of scapula
Subclavius OINA:
O: Rib 1 and costal cartilage I: Mid 3rd of clavicle N: Nerve to subclavius A: Depresses clavicle
Supraspinatus OINA:
O: Supraspinatus fossa I: Greater tubercle N: Subscapular A: Abduct arm
Infraspinatus OINA:
O: Infraspinatus fossa I: Greater tubercle N: subscapular A: External rotator
Teres Minor OINA:
O: Lateral scapula I: Greater tubercle N: Axillary A: External rotator
Subscapularis OINA:
O: Subscapular fossa I: Lesser tubercle N: upper and lower subscapular A: Internal rotator and adduct arm
Teres Major OINA:
O: Inferior angle of scapula I: Intertubercular groove N: Low subscapular A: Internal rotation and adduct arm
Trapezius OINA:
O: C7-T12 I: Clavicle, Acromion, Spine of scapula N: Cranial nerve XI A: elevate and rotate scapula
Latissimus Dorsi OINA:
O: T7-T12, Illiac crest I: Intertubercular groove N: Thoracodorsal A: Adduct, extend, internal rotation
Levator scapulae OINA:
O: C1-C4 I: Superior medial scapula N: Dorsal scapular, C3-C4 A: Elevate scapula
Rhomboid minor OINA:
O: C7- T1 I: Medial scapula N: dorsal scapular A: Adduct scapula
Rhomboid Major OINA:
O: T2- T5 I: Medial scapula N: Dorsal scapular A: Adduct scapula
Muscle of the Thenar compartment:
APB FPB OP
Muscles of the Adductor compartment:
Adductor Pollicis
Muscles of the Hypothenar compartment:
PB Abductor Digiti Minimi Flexor Digiti Minimi Brevis Opponens Digiti minimi
2-5 Intrinsic Muscles:
Lumbricals 1-4 Dorsal interosseous Palmar interosseous
2-5 Extrinsic muscles:
EDC EDM Extensor indicis proprius FDS FDP
Intrinsic thumb muscles:
APB OP FPB Adductor Pollicis 1st palmar interossei
Extrinsic Thumb muscles:
APL FPL EPL EPB
Common Extensor Tendon Muscles:
Anconeus Extensor Digitorum Communis Extensor Digiti Minimi Extensor carpi ulnaris Extensor carpi radialis
Deep Extensor muscles:
Supinator APL EPB EPL Extensor indicis proprius
Common flexor Tendon muscles:
Pronator Teres Palmaris longus Flexor Carpi radialis Flexor Carpi ulnaris Flexor digitorum superficialis
Deep Flexor muscles of the arm:
Flexor digitorum profundus Flexor Pollicis Longus Pronator Quadratus
Origin of Platysma:
Fascia: deltoid/ pectoralis major
Insertion of the platysma:
Mandible; skin
Action of the platysma:
Depress jaw
Innervation of Platysma:
CN 7
Origin of sternocleidomastoid:
Manubrium & clavicle
Insertion of the sternocleidomastoid:
Mastoid process
Action of the sternocleidomastoid:
Turn head to opposite side
Innervation of sternocleidomastoid:
CN 11
Origin of the anterior scalene muscles:
C3-6 transverse process
Insertion of anterior and middle scalene muscles:
1st rib
Action of the scalene muscles:
Laterally flexes neck and elevates 1st or 2nd rib
Innervation of the scalene muscles:
C5-C8 nerve roots
Origin of the posterior scalene muscles:
C4-6 transverse process
Origin of the middle scalene muscles:
C2-7 transverse process
Insertion of the posterior scalene muscle:
2nd rib
Origin of the serratus posterior superior:
Spinous process C7-T3
Insertion of the serratus posterior superior:
Ribs 2-5
Action of the serratus posterior superior:
Elevate ribs
Innervation of the serratus posterior superior:
Intercostal (T1-4)
Origin of serratus posterior inferior:
Spinous process T11-L3
Insertion of serratus posterior inferior:
Ribs 9-12
Action of serratus posterior inferior:
Depress ribs
Innervation of the serratus posterior inferior:
Intercostal (T9-12)
Origin of the splenius capitis:
Ligamentum nuchae
Insertion of the splenius capitis:
Mastoid and nuchal line
Action of the splenius capitis and cervicis:
Laterally flex and rotate neck to same side
Innervation of splenius capitis and cervicis:
Dorsal rami of inferior cervical nerves
Origin of the splenius cervicis:
Spinous process T1-6
Insertion of the splenius cervicis:
Transverse process C1-4
Deep intrinsic back muscles:
Splenius capitis Splenius cervicis Iliocostalis Longissimus Spinalis Semispinalis capitus Semispinalis (C&T) Multifidus (C2-S4) Rotatores Levator costarum Interspinales Intertransversarii
Muscles of the spinotransverse group (superficial layer):
Splenius capitis Splenius cervicis
Muscles of the sacrospinalis group (erector spinae):
Iliocostalis Longissimus Spinalis
Muscles of the transversospinalis group (deep)
Semispinalis capitus Semispinalis (C&T) Multifidus (C2-S4) Rotatores Levator costarum Interspinales Intertransversarii
Origin of the erector spinae:
Sacrum, iliac crest and lumbar spinous process
Insertion of the iliocostalis:
Ribs
Insertion of the longissimus:
T and C spinous process, mastoid process
Insertion of the spinalis:
T spinous process
Action of the erector spinae:
Laterally flex, extend, and rotate head and vertebral column
Innervation of the erector spinae:
Dorsal rami of spinal nerve
Origin of the semispinalis capitus:
Transverse process T1-6
Insertion of the semispinalis capitus:
Nuchal ridge
Action of the semispinalis capitus:
Extend head
Origin of the Semispinalis (C&T):
Transverse process
Insertion of the semispinalis (C&T):
Spinous process
Action of the semispinalis (C&T):
Extend, rotate opposite side
Origin of the multifidus (C2-S4):
Transverse process
Insertion of the multifidus (C2-S4):
Spinous process
Action of the multifidus (C2-S4):
Flex laterally, rotate opposite
Origin of the rotatores:
Transverse process
Insertion of the rotatores:
Spinous process +1
Action of the rotatores:
Rotate superior vertebrae opposite
Origin of the levator costarum
Transverse process
Insertion of the levator costarum:
Brevis: rib -1 Longus: rib -2
Action of the levator costarum:
Elevate rib during inspiration
Origin of the interspinales:
Spinous process
Insertion of the interspinales:
Spinous process +1
Action of the interspinales:
Extend column
Origin of the intertransversarii:
Transverse process
Insertion of the intertransversarii:
Transverse process +1
Action of the intertransversarii:
Laterally flex column
Innervation of the transversospinalis group:
Dorsal primary rami
Origin of the psoas major:
T12-L5 vertebrae
Insertion of the psoas major:
Lesser trochanter
Innervation of the psoas major:
Femoral
Action of the psoas major:
Flex hip
Origin of psoas minor:
T12-L1 vertebrae
Insertion of psoas minor:
Iliopubic eminence
Innervation of the psoas minor:
L1- ventral ramus
Action of the psoas minor:
Assists in hip flexion
Origin of illiacus:
Illiac fossa/ sacral ala
Insertion of illiacus:
Lesser trochanter
Innervation of illiacus:
Femoral
Action of the illiacus:
Flex hip
Tensor Fasciae Latae origin:
Iliac crest, ASIS
Tensor fasciae latae insertion:
Iliotibial band/ proximal tibia
Tensor Fasciae Latae innervation:
Superior Gluteal
Tensor Fasciae Latae action:
Abducts, flex, IR thigh
Gluteus Medius and minimus origin:
Ilium between anterior and posterior gluteal lines
Gluteus medius insertion:
Greater trochanter (posterior)
Gluteus medius innervation:
Superior gluteal
Gluteus minimus insertion:
Greater trochanter (anterior)
Gluteus minimus innervation:
Superior gluteal
Gluteus medius and minimus action:
Abducts, IR thigh
Hip Flexors:
Psoas Major and minor Iliacus
Hip abductors:
TFL Glute med Glute min
Hip extensors and external rotators:
Glute max Obturator externus
Gluteus Maximus origin:
Ilium, dorsal sacrum
Gluteus Maximus insertion:
ITB, gluteal tuberosity of the femur
Gluteus Maximus innervation:
Inferior gluteal
Gluteus Maximus Action:
Extend, ER thigh
Obturator externus origin:
Ischiopubic rami, obturator membrane
Obturator externus insertion:
Trochanteric fossa
Obturator externus innervation:
Obturator
Obturator externus action:
ER thigh
Short external rotators:
Piriformis Superior and inferior gemellus Obturator internus Quadratus femoris
Piriformis origin:
Anterior sacrum
Piriformis insertion:
Superior greater trochanter
Piriformis innervation:
N. To piriformis
Piriformis action:
ER thigh
Superior gemellus origin:
Ischial spine
Superior gemellus insertions:
Medial greater trochanter
Superior gemellus innervation:
N. To obturator internus
Superior gemellus action:
ER thigh
Obturator internus origin:
Ishopubic rami, obturator membrane
Obturator internus insertion:
Medial greater trochanter
Obturator internus innervation:
N. To obturator internus
Obturator internus action:
ER, abduct thigh
Interior gemellus origin:
Ischial tuberosity
Inferior gemellus insertion:
Medial greater trochanter
Inferior gemellus innervation:
N. To quadratus femoris
Inferior gemellus action:
ER thigh
Quadratus femoris origin:
Ischial tuberosity
Quadratus femoris insertion:
Intertrochanteric crest
Quadratus femoris innervation:
N. To quadratus femoris
Quadratus femoris action:
ER thigh
Articularis genus origin:
Distal anterior femoral shaft
Articularis genus insertion:
Synovial capsule
Articularis genus innervation:
Femoral
Articularis genus action:
Pulls capsule superiorly in extension
Sartorius origin:
ASIS
Sartorius insertion:
Proximal Medial tibia (Pes anserinus)
Sartorius innervation:
Femoral
Sartorius action:
Flex, ER hip
Rectus femoris origin:
AIIS Superior acetabular rim
Rectus femoris insertion:
Patella/ tibial tubercle
Rectus femoris innervation:
Femoral
Rectus femoris action:
Flex thigh, extend leg
Vastus lateralis origin:
Greater trochanter, lateral linea aspect
Vastus lateralis insertion:
Lateral patella/ tibia tubercle
Vastus lateralis innervation:
Femoral
Vastus lateralis action:
Extend leg
Vastus intermedius origin:
Proximal femoral shaft
Vastus intermedius insertion:
Patella/ tibia tubercle
Vastus intermedius innervation:
Femoral
Vastus intermedius action:
Extend leg
Vastus medialis origin:
Intertrochanteris line Medial linea aspera
Vastus medialis insertion:
Medial patella/ tibia tubercle
Vastus medialis innervation:
Femoral
Vastus medialis action:
Extend leg
Adductor longus origin:
Body of pubis (inferior)
Adductor longus insertion:
Linea aspera (mid 1/3)
Adductor longus innervation:
Obturator
Adductor longus action:
Adducts thigh
Adductor brevis origin:
Body and inferior pubic ramus
Adductor brevis insertion:
Pectineal line Linea aspera
Adductor brevis innervation:
Obturator
Adductor brevis action:
Adducts thigh
Adductor magnus origin:
Pubic ramus Ischial tuberosity
Adductor magnus insertion:
Linea aspera Add. Tubercle
Adductor magnus innervation:
Obturator Sciatic
Adductor magnus action:
Adducts and flex/ Extend/ IR leg
Pectineus origin:
Pectineal line of pubis
Pectineus insertion:
Pectineal line of femur
Pectineus innervation:
Femoral
Pectineus action:
Flex and adducts thigh
Semitendinosus origin:
Ischial tuberosity
Semitendinosus insertion:
Proximal medial tibia (pes anserinus)
Semitendinosus innervation:
Sciatic (tibial)
Semitendinosus action:
Extend thigh, flex leg
Semimembranosus origin:
Ischial tuberosity
Semimembranosus insertion:
Posterior medial tibial condyle
Semimembranosus innervation:
Sciatic (Tibial)
Semimembranosus action:
Extend thigh, flex leg
Biceps femoris long head origin:
Ischial tuberosity
Biceps femoris long head insertion:
Head of fibula
Biceps femoris long head action:
Extend thigh, flex leg
Biceps femoris short head:
Linea aspera, supracondylar line
Biceps femoris short head insertion:
Fibula Lateral tibia
Biceps femoris short head innervation:
Sciatic (peroneal)
Biceps femoris short head action:
Extend thigh, flex leg
Sciatic nerve is in what compartment?
Posterior
Femoral artery and vein is in what compartment?
Medial
What is in the anterior compartment of the lower leg?
Tibialis anterior Extensor Hallucis longus Extensor digitorum longus Peroneus tertius Deep peroneal nerve Anterior tibial artery and vein
What is in the lateral compartment of the lower leg?
Peroneus longus Peroneus brevis Superficial peroneal nerve
What is in the superficial posterior compartment of the lower leg?
Gastrocnemius Soleus Plantaris
What is in the deep posterior compartment of the lower leg?
Posterior tibialis Flexor hallucis longus Flexor digitorum longus Popliteus Tibial nerve Posterior tibial artery and vein Peroneal artery and vein
Tibialis anterior origin:
Proximal lateral tibia (Gerdy’s tubercle)
Tibialis anterior insertion:
Med. cuneiform, Plantar 1st metatarsal base
Tibialis anterior innervation:
Deep peroneal
Tibialis anterior action:
Dorsiflexion Invert foot
Extensor Hallucis longus origin:
Medial fibula Interosseous membrane
Extensor hallucis longus insertion:
Base of distal phalanx of great toe
Extensor hallucis longus innervation:
Deep peroneal
Extensor hallucis longus action:
Dorsiflex Extend great toe
Extensor digitorum longus origin:
Lateral tibia condyle and proximal fibula
Extensor digitorum longus insertion:
Base of middle and distal phalanges (4 toes)
Extensor digitorum longus innervation:
Deep peroneal
Extensor digitorum longus action:
Dorsiflex Extend lateral 4 toes
Peroneus tertius origin:
Distal fibula, Interosseous membrane
Peroneus tertius insertion:
Base of 5th metatarsal
Peroneus tertius innervation:
Deep peroneal
Peroneus tertius action:
Dorsiflex Evert foot
Peroneus longus origin:
Proximal lateral fibula
Peroneus longus insertion:
Plantar medial cuneiform 1st metatarsal base
Peroneus longus innervation:
Superficial peroneal
Peroneus longus action:
Plantar flex foot (1st ray)
Peroneus brevis origin:
Distal lateral fibula
Peroneus brevis insertion:
Base of 5th metatarsal
Peroneus brevis innervation:
Superficial peroneal
Peroneus brevis action:
Evert foot
Gastrocnemius origin:
Lateral and medial femoral condyles
Gastrocnemius insertion:
Calcaneus (via Achilles’ tendon)
Gastrocnemius innervation:
Tibial
Gastrocnemius action:
Plantar flex foot
Soleus origin:
Posterior fibular head/ soleal line of tibia
Soleus insertion:
Calcaneus (via Achilles’ tendon)
Soleus innervation:
Tibial
Soleus action:
Plantar flex foot
Plantaris origin:
Lateral femoral supracondylar line
Plantaris insertion:
Calcaneus
Plantaris innervation:
Tibial
Plantaris action:
Plantar flex foot
Popliteus origin:
Lateral femoral condyle (anterior and distal to LCL)
Popliteus insertion:
Proximal posterior tibia
Popliteus innervation:
Tibial
Popliteus action:
IR tibia/ knee (during swing phase)
Flexor hallucis longus origin:
Posterior fibula
Flexor hallucis longus insertion:
Base of distal phalanx of great toe
Flexor hallucis longus innervation:
Tibial
Flexor hallucis longus action:
Plantar flex great toe
Flexor digitorum longus origin:
Posterior tibia
Flexor digitorum longus insertion:
Base of distal phalanges of 4 toes
Flexor digitorum longus innervation:
Tibial
Flexor digitorum longus action:
Plantar flex lateral 4 toes
Tibialis Posterior origin:
Posterior tibia Fibula Interosseous membrane
Tibialis posterior insertion:
Plantar navicular cuneiforms MT bases
Tibialis posterior innervation:
Tibial
Tibialis posterior action:
Plantar flex and invert foot (in heel off phase)
Function of superior extensor retinaculum:
Covers tendons, nerves, vessels of anterior compartment at ankle
Function of the inferior extensor retinaculum:
Surrounds and covers tendons, etc. of anterior compartment in foot
Function of the flexor retinaculum:
Covers tendons of posterior compartment
Function of the superior and inferior peroneal retinaculum
Covers tendons and sheaths of lateral compartment at hind foot
Function of plantar aponeurosis:
Supports longitudinal arch Protects underlying structures Stabilizes foot in gait via the windlass mechanism
First plantar layer of the foot:
Abductor hallucis Flexor digitorum brevis Abductor digiti minimi
Abductor hallucis origin:
Calcaneal tuberosity Medial process
Abductor hallucis insertion:
Through med, sesamoid to proximal phalanx of great toe
Abductor hallucis innervation:
Medial plantar
Abductor hallucis action:
Abducts great toe
Abductor digiti minimi origin:
Calcaneal tuberosity Medial and lateral processes
Abductor digiti minimi insertion:
Lateral base of proximal phalanx of 5th toe
Abductor digiti minimi innervation
Lateral plantar
Abductor digiti minimi action:
Abducts small toe
Second plantar layer of the foot:
Quadratus plantae Lumbricals
Quadratus plantae origins:
Medial and lateral plantar calcaneus
Quadratus plantae insertion:
Lateral FDL tendon
Quadratus plantae innervation:
Lateral plantar
Quadratus plantae action:
Assists FDL with toe flexion
Lumbricals origin:
Separate FDL tendons
Lumbricals insertion:
Proximal phalanges Extensor expansion
Lumbricals innervation:
1: medial plantar 2-4: lateral plantar
Lumbricals action:
Flex MTP joint Extend IP joint
Third plantar layer of the foot:
Flexor hallucis brevis Adductor hallucis Flexor digiti minimi brevis
Adductor hallucis origin:
Oblique: base 2-4 MT Transverse: lateral 4 MTP
Adductor hallucis insertion:
Through lateral sesamoid to lateral proximal phalanx of great toe
Adductor hallucis innervation:
Lateral plantar
Adductor hallucis action:
Adducts great toe
Flexor digiti minimi brevis origin:
Base of 5th metatarsal
Flexor digiti minimi brevis insertion:
Base of proximal phalanx of small toe
Flexor digiti minimi brevis innervation:
Lateral plantar
Flexor digiti minimi brevis action:
Flex small toe
Fourth plantar layer of the foot:
Plantar interossei Dorsal interossei
Plantar interossei (3) origin:
Medial 3rd, 4th, 5th MT
Plantar interossei (3) insertion:
Medial proximal phalanges: toes 3-5
Plantar interossei (3) innervation:
Lateral plantar
Plantar interossei (3) action:
Adduct toes Flex MTPJ Extend LPJ
Dorsal interossei (4) origin:
Adjacent MT shafts
Dorsal interossei (4) insertion:
Medial proximal phalanx (2nd toe) Lateral proximal phalanx (toes 2-4)
Dorsal interossei (4) innervation:
Lateral plantar
Dorsal interossei (4) action:
Abduct toes
Dorsum layer of the foot:
Extensor hallucis brevis Extensor digitorum brevis
Extensor hallucis brevis origin:
Dorsolateral calcaneus
Extensor hallucis brevis insertion:
Base of proximal phalanx of great toe
Extensor hallucis brevis innervation:
Deep peroneal
Extensor hallucis brevis action:
Extends great toe at MCPJ
Extensor digitorum brevis origin:
Dorsolateral calcaneus
Extensor digitorum brevis insertion:
Base of proximal phalanx: toes 2-4
Extensor digitorum brevis innervation:
Deep peroneal
Extensor digitorum brevis action:
Extends lesser toes at MCPJ