Fascia of Palm Flashcards
The palmar aspect of the hand features a central concavity that separates into two eminences. What are they?
- Thenar
2. Hypothenar
Thenar Eminence
lateral, more prominent, at the base of the thumb.
Hypothenar Eminence
medial, smaller, proximal to the base of the 5th finger.
The fascia of the palm is continuous with what?
The antebrachial fascia and the fascia of the dorsum of the hand.
Where on the hand is the fascia thin?
Over the thenar and hypothenar eminences.
Where on the hand is the fascia thick?
Centrally, where it forms the fibrous palmar aponeurosis and in the fingers where it forms the digital sheaths.
Describe the palmar aponeurosis
a strong, well defined part of the deep fascia of the palm.
What does the palmar aponeurosis form?
four longitudinal digital bands
What does the palmar aponeurosis cover and overly?
the soft tissues and overlies the long flexor tendons.
Where does the palmar aponeurosis begin?
radiates from the apex of the hand
Where does the palmar aponeurosis end?
attach distally to the bases of the proximal phalanges
What does the palmar aponeurosis turn into at the bases of the phalanges?
where they become continuous with the fibrous digital sheath.
What are the fibrous digital sheaths?
ligamentous tubes that enclose the flexor tendons and the synovial sheaths that surround them as they pass along the palmar aspect of their respective digit.
Where does the medial fibrous septum extend?
extends deeply from the medial border of the palmar aponeurosis to the 5th metacarpal.
What is medial to the medial fibrous septum?
The medial or hypothenar compartment
What does the hypothenar compartment contain (broad)?
the hypothenar muscles
Where does the lateral fibrous septum extend?
extends deeply from the lateral border of the palmar aponeurosis to the 3rd metacarpal.
What is lateral to the lateral fibrous septum?
the lateral or thenar compartment
What does the thenar compartment contain (broad)?
the thenar muscles
What is located between the hypothenar and the thenar compartment?
The Central Compartment
What does the central compartment contain (broad)?
- flexor tendons and their sheath
- lubrical muscles
- superficial palmar arterial arch, and
- digital vessels and nerves.
What is the deepest muscular plane of the palm?
The Adductor Compartment
What does the Adductor Compartment contain?
The Adductor Pollicis
What are the two potential spaces between the flexor tendons and the fascia covering the deep palmar muscles?
- Thenar Space
2. Midpalmar Space
What is between the thenar and midpalmar spaces?
Lateral fibrous septum
Describe the Lateral Fibrous Septum
especially strong, attached to the 3rd metacarpal.
What is the Midpalmar space continuous with?
anterior compartment of the forearm via the carpal tunnel.
What is the apex of the palmar aponeurosis continuous with?
the flexor retinaculum and the palmaris longus tendon.
