Related Experiment Videos
Chiropteran tendon locking mechanism
1Division of Anatomy, Creighton University School of Medicine, Omaha, Nebraska 68178.
Journal of Morphology
|May 1, 1993
Summary
Bats utilize a unique tendon locking mechanism (TLM) for effortless hanging, unlike other mammals. This ratchet-like structure in tendons and sheaths aids in gripping, showcasing convergent evolution with birds.
Area of Science:
- Comparative anatomy
- Biomechanics
- Evolutionary biology
Background:
- Mammalian tendons typically minimize friction.
- Bats possess a specialized tendon locking mechanism (TLM) for hanging.
- This TLM is located on the flexor tendon complex of digits.
Purpose of the Study:
- To investigate the presence, morphology, and function of the TLM in bats.
- To compare TLM across different chiropteran families and suborders.
- To explore the evolutionary implications of TLM, including convergent evolution.
Main Methods:
- Studied the third digit of the pelvic limb and pollex in 15 chiropteran families.
- Examined the morphology of tendon tubercles and sheath ridges.
- Assessed the functional implications of the TLM for hanging behavior.
Main Results:
- Most studied bat species possess a TLM with tendon tubercles and sheath ridges.
- The TLM functions like a ratchet, enabling low-effort gripping.
- TLM is present in both megachiropterans and microchiropterans, but absent in some species like phyllostomids.
Conclusions:
- The bat TLM is a key adaptation for arboreal locomotion and hanging.
- The TLM demonstrates functional similarity and convergent evolution with a similar structure found in birds.
- TLM variation across bat species suggests diverse evolutionary pressures and adaptations.