Anatomy Experience:Analysis of Alan Dancing

Introduction

• The muscles listed are concentrically contracting to produce these movements. The muscles that are eccentrically contracting are the antagonist muscles (e.g., for abduction, the eccentrically contracting muscles are the muscles listed to adduction).

• Most images were taken from the IFA Essentials and from the YouTube clip “Alan dancing” (http://www.youtube.com/watch?v=-WcP0JkMHV8). Muscles were found in the class notes from MoveSci 230 with Dr. Anthony Drew, with the exception of the muscles listed under anterior/posterior pelvic tilt, which were found by making educated guesses and checking Wikipedia.

• A big thank you to Alan Nagel for his inspiration.

Hands on Hips: Shoulder

• Abduction– Intermediate deltoid

(primary abductor)– Supraspinatus– Anterior/posterior

deltoid (assists)

• Medial rotation– Anterior deltoid– Latissimus dorsi– Subscapularis– Pectoralis major

Hands on Hips: Shoulder

Abduction Medial rotation

Hands on Hips: Elbow, Wrist• Pronation

– Pronator quadratus (primary pronator)

– Pronator teres

• Elbow flexion– Brachialis– Brachioradialis– Biceps brachii– Pronator teres

• Radial deviation– Flexor carpi radialis– Extensor carpi radialis

longus/brevis

Hands on Hips: Elbow, Wrist

Pronation Elbow flexion Radial deviation

To the Left: Hips

• Left: Adduction– Pectineus– Adductor group (brevis,

longus, magnus)– Gracilis

• Right: Abduction– Sartorius– Tensor fasciae latae– Gluteus medius,

minimus

To the Left: Subtalar (not shown)

• Left: Inversion– Tibialis anterior,

posterior– Flexor digitorum longus

• Right: Eversion– Peroneal group (longus,

brevis, tertius)– Extensor digitorum

longus (weak)

Hips to the Right: Hips

• Left: Abduction– Sartorius– Tensor fasciae latae– Gluteus medius,

minimus

• Right: Adduction– Pectineus– Adductor group (brevis,

longus, magnus)– Gracilis

Hips to the Right: Subtalar (not shown)

• Left: Eversion– Peroneal group (longus,

brevis, tertius)– Extensor digitorum

longus (weak)

• Right: Inversion– Tibialis anterior,

posterior– Flexor digitorum longus

To the Left/Right: Hips

Adduction Abduction

To the Left/Right: Subtalar

Inversion Eversion

Hips ForwardBack to anatomical position:• Hip (left)– Adduction

• Hip (right)– Abduction

• Subtalar (left)– Inversion

• Subtalar (right)– Eversion

Hips Forward• Hips: Posterior pelvic tilt

– Rectus abdominus– Gluteus maximus– Biceps femoris– Semitendinosus– Semimembranosus– Adductor magnus

• Knees: Flexion– Biceps femoris– Popliteus– Semimembranosus– Semitendinosus– Gastrocnemius (assists)– Plantaris (assists)

Hips Backward

• Hips: anterior pelvic tilt– Iliacus

• Knees: extension– Vasti group (medialis,

intermedius, lateralis)– Rectus femoris

Hips Forward/Backward: Hips

Anterior pelvic tilt Posterior pelvic tilt

Hips Forward/Backward: Knees

Flexion Extension

Hips to the Left(Back to anatomical position:• Hips

– Posterior pelvic tilt)

• Hip (left)– Adduction

• Hip (right)– Abduction

Not shown:

• Subtalar (left)– Inversion

• Subtalar (right)– Eversion

High Steps: Trunk

• Flexion– Rectus abdominus– External obliques– Internal obliques– Psoas major (entire

iliopsoas is used in full movement)

• Extension– Erector spinae group– Interspinales

High Steps: Trunk

Flexion Extension

High Steps: Hips• Flexion

– Sartorius– Tensor fasciae latae– Rectus femoris– Iliopsoas– Pectineus– Adductor brevis, longus– Gracilis– Gluteus medius

• Extension– Gluteus maximus– Adductor magnus– Semimembranosus– Semitendinosus– Biceps femoris (long head)

High Steps: Hips

Flexion Extension

High Steps: Knees

• Flexion– Biceps femoris– Popliteus– Semimembranosus– Semitendinosus– Gastrocnemius (assists)– Plantaris (assists)

• Extension– Vasti group (medialis,

intermedius, lateralis)– Rectus femoris

High Steps: Knees

Flexion Extension

High Steps: Ankles• Plantar flexion

– Gastrocnemius– Plantaris– Soleus– Tibialis posterior (assists)– Flexor digitorum longus (assists)– Flexor hallucis longus (assists)– Peroneus longus, brevis (assists)

• Dorsiflexion– Peroneus tertius– Tibialis anterior– Extensor digitorum longus

(assists)– Extensor hallucis longus (assists)

High Steps: Ankles

Plantar flexion Dorsiflexion

Hands Galloping/Wrist Toggling• Extension/hyperextension

– Extensor carpi radialis longus/brevis– Extensor carpi ulnaris

• Flexion– Flexor carpi radialis– Flexor carpi ulnaris– Palmaris longus (assists)– Flexor digitorum superficialis

(assists)– Flexor digitorum profundus (assists)

• Interphalangeal flexion (once)– Flexor digitorum superficialis– Flexor digitorum profundus– Flexor pollicis longus

Hands Galloping/Wrist Toggling

Flexion Extension