Search results for “Accessory Muscles”

197 results found
Article

Accessory muscle

Accessory muscles are a form of anatomic variation that refers to supplementary discrete muscles that are found alongside the normal expected musculature. They have been described in the neck, thorax, pelvis, upper and lower limbs. See also accessory muscles of respiration
Article

Accessory muscles of the ankle

Accessory muscles of the ankle are muscular anatomical variants that are usually asymptomatic but rarely cause symptoms or might be encountered on imaging studies. The following accessory muscles around the ankle have been described 1-4: posteromedial/flexor compartment accessory flexor digit...
Article

Accessory muscles of respiration

Accessory muscles of respiration refer to muscles that provide assistance to the main breathing muscles, mainly when additional power is needed, for example during exercise or those with airway pathologies (e.g. COPD) 1,2. During normal quiet breathing, inspiration is an active process primaril...
Article

Accessory muscles of the forearm, wrist and hand

Accessory muscles of the forearm, wrist and hand are muscular, usually asymptomatic, anatomical variants that might be encountered on imaging studies and confused with pathologic conditions. The following accessory muscles around the forearm, wrist and hand have been described 1-6: ​elbow acc...
Article

Accessory peroneal muscles

Accessory peroneal muscles are a group of accessory muscles that can occur in the foot region as a normal variant in some individuals. The peroneal compartment is known as the lateral compartment of the leg. Peroneus quartus muscle Originally, several accessory muscles were distinguished in th...
Article

Accessory brachialis muscle

An accessory brachialis muscle, also known as brachialis accessorius muscle, is a very rare accessory muscle of the elbow and an anatomical variant. Summary origin: anterior surface of the lower humeral diaphysis course: variably medial or lateral to the brachialis muscle insertion: variable...
Article

Accessory soleus muscle

The accessory soleus muscle is an anatomical variant characterized by an additional distinct muscle encountered along a normal soleus muscle. It is uncommon with a prevalence of ~3% (range 0.7-5.5%) 1. Summary origin: fibula, soleal line of the tibia, or the anterior surface of the soleus musc...
Article

Accessory semimembranosus muscle

The accessory semimembranosus muscle is a rare accessory muscle of the posterior compartment of the thigh. It arises from the distal aspect of the semimembranosus muscle belly and courses through the popliteal fossa between it and the semitendinosus muscle medially and the biceps femoris lateral...
Article

Accessory flexor carpi ulnaris muscle

The accessory flexor carpi ulnaris (AFCU) is a rare accessory muscle of the forearm and wrist and a normal anatomical variant that can be found in addition to a normal flexor carpi ulnaris muscle. Epidemiology The accessory flexor carpi ulnaris muscle is considered very rare 1,2. Associations...
Article

Accessory flexor digitorum longus muscle

The accessory flexor digitorum longus muscle is an accessory muscle in the deep posterior compartment of the leg with a reported prevalence of 6-8%. Unilateral muscles are more common although bilateral cases have been reported. Summary origin: variable; either the medial margin of the tibia a...
Article

Accessory extensor digiti secundus muscle

The accessory extensor digiti secundus muscle is a rare accessory muscle or tendon of the ankle and an anatomical variant. Summary origin: extensor hallucis longus tendon or muscle insertion: medial phalanx of the second toe adjacent to the second tendon of the extensor digitorum longus muscl...
Article

Accessory abductor digiti minimi muscle (hand)

An accessory abductor digiti minimi (ADM) muscle is the most common accessory muscle of the hand and wrist, found in 24% of individuals on the hypothenar eminence. When present it is one of the intrinsic muscles of the hand. Summary origin: antebrachial fascia passing anteriorly to Guyon cana...
Case

Subclavius posticus muscle - an accessory muscle

  Diagnosis certain
Matt Skalski
Published 09 Sep 2014
84% complete
MRI Annotated image
Article

Accessory flexor digitorum superficialis indicis muscle

An accessory flexor digitorum superficialis indicis muscle is an unusual accessory muscle of the hand and wrist and a normal anatomical variant. Summary origin: flexor digitorum superficialis tendon near the transverse carpal ligament insertion: metacarpal head of the index finger near the A1...
Case

Digastric muscle - accessory belly

  Diagnosis almost certain
Maulik S Patel
Published 03 Dec 2022
72% complete
Ultrasound Annotated image
Case

Accessory piriformis muscle

  Diagnosis certain
Ali Alsmair
Published 24 Jan 2022
95% complete
Annotated image MRI
Case

Accessory soleus muscle

  Diagnosis certain
Maulik S Patel
Published 04 May 2019
94% complete
Ultrasound
Case

Accessory soleus muscle

  Diagnosis certain
Ali Alsmair
Published 31 Aug 2022
95% complete
MRI
Case

Accessory soleus muscle

  Diagnosis certain
Bahman Rasuli
Published 20 Oct 2022
92% complete
MRI
Case

Accessory soleus muscle

  Diagnosis certain
Magdalena Chmiel-Nowak
Published 15 Apr 2020
89% complete
MRI

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